Electric energy metering box and production device thereof

Abstract

The invention relates to the technical field of stamping equipment, and particularly discloses an electric energy metering box and a production device thereof.The electric energy metering box comprises a stamping die, the stamping die comprises an upper die and a lower die, and a plurality of guide assemblies are installed between the upper die and the lower die; an oil cavity is formed in the position, surrounding the bottom, of the lower die and filled with lubricating oil. The guide sleeve is fixedly mounted on the upper die and is in sliding fit with the guide column; the lubricating assembly comprises a connecting ring and a plurality of connecting ropes, the two ends of the connecting ropes are connected with the bottom end of the connecting ring and the bottom of the oil cavity respectively, the connecting ring is rotationally installed at the bottom of the guide sleeve, and when the guide sleeve is located at the lowest height, the connecting ropes are immersed in lubricating oil, so that complexity and non-timeliness of a regular oiling mode are avoided; and the problems of non-uniform solid lubrication distribution, unstable grease release and the like of the self-lubricating guide sleeve are solved, and the lubrication state between the guide column and the guide sleeve can be effectively kept in the production and stamping process of the electric energy metering box shell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stamping equipment, in particular to an electric energy metering box and a production device thereof. BACKGROUND

[0002] The electric energy metering box is a special box body for installing electric energy meters, collecting terminals and related metering equipment in the power grid system, and is widely used in residential areas, industrial and mining enterprises and public facilities. With the advancement of smart grid construction, higher requirements are put forward for the protection level, corrosion resistance, dimensional accuracy and appearance quality of the electric energy metering box. The shell of the electric energy metering box is usually made of cold-rolled steel plate, galvanized sheet or stainless steel sheet, which is formed through multiple stamping processes such as blanking, punching, stretching and bending. Multiple processes such as blanking, punching, flanging, bending, stretching and rib forming need to be completed to realize the structures of the box body, the door, the mounting panel and the wire inlet.

[0003] The stamping die is a tool specially used in the stamping process, which is mainly used for forming and processing metal plates or continuous coils through a punch. In modern industrial manufacturing, stamping dies are widely used in the fields of automobiles, home appliances and electronics. In the existing design of stamping dies, when the die is opened and closed, the guiding function in the vertical direction is usually completed by the guide column and the guide sleeve. The main function of this guiding mechanism is to ensure accurate positioning of the die during opening and closing, avoiding misalignment. If there is no such guiding structure or the guiding function fails, the die will lack accurate positioning during closing, resulting in inconsistent closing positions of the die during each stamping process. This situation not only affects the forming accuracy of the stamped parts, but also may cause product size deviation and even increase the scrap rate.

[0004] The Chinese patent document with the authorization announcement number CN105363931B discloses an automatic lubricating guide column and guide sleeve assembly, which comprises a guide column, a guide sleeve and a ball retainer. The ball retainer is a cylindrical structure, which is sleeved between the guide column and the guide sleeve. An oil storage groove is arranged at the bottom of the guide column, and lubricating oil is filled in the oil storage groove. A plurality of oil inlet holes are arranged on the guide sleeve, and the diameter of the oil inlet holes is much smaller than the diameter of the balls. The oil inlet holes are inclined downward from the outer wall of the guide sleeve to the inner wall. During operation, the lubricating oil enters the interior of the guide sleeve through the oil inlet holes, and then uniformly covers the gap between the guide column, the balls and the guide sleeve through the rolling of the balls, thereby improving the lubricating effect and reducing the wear of the equipment. At the same time, manual lubrication is not required, the work efficiency is improved, and the assembly has good application prospect.

[0005] In the production of the electric energy metering box shell, due to the thick plate, large structure size, many hole positions and high precision requirement of the box body, the stamping die is usually continuously used on a high-tonnage press, the opening and closing frequency of the die is high, the impact force is large, and the friction load between the guide pillar and the guide sleeve is obviously higher than that of the ordinary sheet metal die. In addition, the electric energy metering box shell is usually continuously processed in the batch production line for a long time, the working environment of the die is affected by metal chips, dust, stamping waste and lubricating oil evaporation, so that the lubrication state between the guide pillar and the guide sleeve is difficult to maintain stable, if there is lack of sufficient lubrication, dry friction, adhesive wear, abrasive wear, thermal fatigue and micro-vibration wear caused by high-speed movement will occur between the guide pillar and the guide sleeve, eventually causing the guide pillar surface to be scratched, the guide sleeve inner wall to be scraped, the gap to be increased, the guide to be deviated, and even the guide pillar to be stuck, the die to be unable to close or the die to be inclined, resulting in the die being scrapped. The traditional stamping die generally uses manual regular oiling to maintain the lubrication of the guide pillar and the guide sleeve, in order to reduce the maintenance workload, some dies begin to use self-lubricating guide sleeves, such as graphite inlaid guide sleeves and powder metallurgy oil immersion guide sleeves, but such self-lubricating structures have problems such as uneven distribution of solid lubrication, unstable release of grease, sensitivity to working temperature, large fluctuation of friction coefficient, and cannot replace the lubricating oil film for a long time under high-frequency stamping conditions, and the guide pillar is still prone to wear. SUMMARY

[0006] The present application provides an electric energy metering box and a production device thereof, aiming to solve the problems of insufficient lubrication of the guide pillar, short maintenance time of the oil film, difficult manual oiling, uneven lubrication leading to accelerated wear of the guide pillar and the guide sleeve, decreased guide precision and shortened die life in the long-term continuous production process of the electric energy metering box shell stamping die in the related art.

[0007] An electric energy metering box comprises a stamping die, the stamping die comprises an upper die and a lower die, a plurality of guide assemblies are installed between the upper die and the lower die, and the guide assemblies comprise: a guide pillar, which is fixedly installed on the lower die, and an oil cavity is arranged around the position of the bottom of the guide pillar on the lower die, and the oil cavity is filled with lubricating oil; a guide sleeve, which is fixedly installed on the upper die and is in sliding cooperation with the guide pillar; a lubricating assembly, which comprises a connecting ring and a plurality of connecting ropes, both ends of the connecting ropes are connected with the bottom end of the connecting ring and the bottom of the oil cavity respectively, and the connecting ring is rotationally installed at the bottom of the guide sleeve; when the guide sleeve is at the lowest height, the connecting ropes are immersed in the lubricating oil; a tightening assembly, which is installed between the connecting ring and the guide sleeve, and when the guide sleeve rises to the maximum height, the tightening assembly rotates the connecting ring relative to the guide sleeve, so that the connecting ropes contact the guide pillar.

[0008] The effect is that: through the cooperation of the above lubricating assembly and the tightening assembly, the lubrication of the guide column can be automatically realized during the opening and closing of the mold. When the guide sleeve is lowered to the lowest height, the connecting rope is immersed in the lubricating oil in the oil cavity and fully absorbs the lubricating oil. When the guide sleeve rises to the maximum height, the tightening assembly rotates the connecting ring relative to the guide sleeve, and the connecting rope contacts the guide column, at this time the lubricating oil adsorbed on the connecting rope will be applied to the guide column, realizing the lubrication of the guide column. This lubrication method can automatically adjust the oil supply according to the opening and closing state of the mold, avoiding the tediousness and untimeliness of the regular oiling method, overcoming the problems of uneven distribution of solid lubrication of self-lubricating guide sleeves, unstable release of grease, etc. In the high-frequency and high-load stamping process of the electric energy metering box shell, the lubrication state between the guide column and the guide sleeve can be effectively maintained, reducing the occurrence of problems such as dry friction, adhesive wear, abrasive wear, etc.

[0009] Preferably, the material of the connecting rope is a nylon braided rope, which has good oil absorption performance and wear resistance. Its fine braided structure can absorb more lubricating oil, and it is not easy to be worn out during the process of contacting and applying lubricating oil to the guide column, ensuring the long-term stable use of the lubricating assembly. At the same time, the nylon braided rope has good flexibility and can flexibly contact and separate from the guide column with the rotation of the connecting ring, and will not be broken due to frequent actions.

[0010] Preferably, the tightening device includes a torsional spring and a control assembly for controlling the release and storage of the torsional spring, and the torsional spring is installed between the guide sleeve and the connecting ring.

[0011] Preferably, the control assembly includes a sliding block arranged on the connecting ring and a vertical rod fixedly installed on the lower mold, the vertical rod is provided with a vertical slide in the vertical direction, one side of the vertical slide is provided with an inclined slide capable of communicating with the vertical slide, and the communication portion is provided with a switching assembly, when the sliding block rises, the switching assembly is in a closed state to prevent the sliding block from entering the inclined slide, when the sliding block slides downward along the inclined slide, the switching assembly switches to a separated state to make the sliding block enter the vertical slide from the inclined slide. This design enables precise control of the storage and release of the torsional spring during the opening and closing of the mold. When the guide sleeve rises, the sliding block rises in the vertical slide, and since the switching assembly is in a closed state, the sliding block can only rise along the vertical slide, and at this time the torsional spring is in a storage state. When the guide sleeve rises to the maximum height, the torsional spring releases energy, the connecting ring rotates, the connecting rope contacts the guide column to realize lubrication, and then the guide sleeve starts to descend to close the mold, the sliding block slides downward in the inclined slide, the switching assembly switches to a separated state, the sliding block enters the vertical slide from the inclined slide, and the torsional spring stores energy.

[0012] Preferably, the number of the inclined slides is multiple, and the top ends of all the inclined slides are arranged in an arc along the rotating direction of the guide sleeve, so that the connecting ring can more smoothly enter the vertical slide from the inclined slide according to different positions and states during the rotation, the process of the torsional spring storage and release is further optimized, and the stability and reliability of the whole lubricating assembly are improved.

[0013] Preferably, the switching assembly comprises a gate, the top end of the gate is hinged to the vertical slide, and the hinge is located above the intersection of the inclined slide and the vertical slide, so that the gate can be flexibly rotated to realize the closed and separated states. When the slider rises, the gate is in the closed state, and the bottom end of the gate prevents the slider from entering the inclined slide, so that the slider can only rise in the vertical slide, and the torsional spring is stored. When the slider slides downward along the inclined slide, the gate is switched to the separated state to provide a channel for the slider to enter the vertical slide from the inclined slide.

[0014] Preferably, the bottom end of the gate is wedge-shaped, and the vertical slide is provided with an embedding groove corresponding to the position of the gate, so that the gate is located in the embedding groove when the gate is in the closed state.

[0015] Preferably, the bottom end of the gate is magnetically connected to the vertical slide, so that the stability of the gate in the closed state can be ensured, and the slider can be prevented from accidentally entering the inclined slide during the rising process.

[0016] Preferably, the vertical slide is provided with a magnet capable of attracting the gate, so that the magnetic connection between the gate and the vertical slide is more reliable, the gate is stably located in the embedding groove during the rising process of the slider, the slider can only rise in the vertical slide, and the torsional spring can be stably stored. When the slider slides downward along the inclined slide, the slider generates a certain acting force on the gate, the acting force overcomes the magnetic force between the gate and the magnet, the gate is rotated to the separated state, the slider can smoothly enter the vertical slide from the inclined slide, and the torsional spring starts to store energy.

[0017] An electric energy metering box, the shell of the electric energy metering box is processed by the electric energy metering box production device.

[0018] The effect is that the electric energy metering box processed by the electric energy metering box production device can ensure high precision and quality in the production process. Because there is good lubrication between the punch die guide column and the guide sleeve of the production device, the die can maintain a stable working state in the continuous punching process with high frequency and high load, reduces the problems such as wear and guide deviation caused by insufficient lubrication, makes the size precision of the punched electric energy metering box shell higher, and the forming quality of each structure better.

[0019] By adopting the technical scheme, the application has the following beneficial effects: In the initial state, that is, the bottom dead center or the closed mold state, the upper die is in the lowest position, and the guide sleeve is at the bottom of the guide pillar. At this time, the slider on the connecting ring moves along the vertical slide at the bottom of the vertical rod, and the torsional spring is "tightened" and in the energy storage state. This rotational position of the connecting ring allows the connecting rope to be in a loose state, and the connecting rope becomes slack, curved, and fully immersed in the hot oil in the oil cavity. By virtue of the excellent oil absorption (capillary effect) of the nylon braided rope, the connecting rope absorbs sufficient lubricating oil in this stage, and then enters the die opening stroke. The upper die is driven upward by the press, and the guide sleeve drives the connecting ring and the slider thereon to rise. When the upper die rises to the maximum height, the slider is disengaged from the vertical slide. Since there is no forced rotational limit above, the torsional spring in the energy storage state begins to release energy, and the torsional spring drives the connecting ring to rotate positively relative to the guide sleeve. With the rotation of the connecting ring, the upper end point of the connecting rope is angularly displaced relative to the lower end point. The originally slack connecting rope is tightened in a spiral shape, and then shrinks to the center, tightly winding and adhering to the cylindrical surface of the guide pillar. At this time, the guide pillar surface is tightly wrapped by the connecting rope and filled with lubricating oil. Then, the die closing stroke, that is, the downward stamping process, is entered. The upper die begins to descend, and the guide sleeve descends with it. The slider enters the inclined slide groove. As the slider slides down along the inclined slide, the connecting ring gradually moves in the opposite direction to store energy in the torsional spring, and the connecting rope also slowly loosens. When the slider abuts against the gate, the gate rotates to open, and the slider smoothly enters the vertical slide from the inclined slide to continue moving downward. The torsional spring is again "tightened" and in the energy storage state. The connecting rope becomes slack, curved, and re-immersed in the hot oil in the oil cavity, preparing for the next die opening stroke to absorb lubricating oil. In the entire working cycle, the device can automatically adjust the state of the connecting rope according to the opening and closing state of the mold, achieving dynamic lubricating oil coating. When the mold is opened, the connecting rope absorbs lubricating oil and winds around the guide pillar, providing sufficient lubrication for the guide pillar. When the mold is closed, the connecting rope loosens and re-immerses in the oil, preparing for the next lubrication. This automatic lubrication method can effectively solve the problems of insufficient lubrication of the guide pillar, short oil film maintenance time, difficult oiling, uneven lubrication leading to increased wear of the guide pillar and guide sleeve, decreased guiding accuracy, and shortened mold life in the long-term continuous production process of the related art. At the same time, the structure of the device is relatively simple, and complex machining and oil path design are not required, avoiding the problem of oil path blockage. Moreover, by reasonably designing the helix angle of the inclined slide and the switching assembly, it can be ensured that the slider will not be stuck during movement, ensuring stable operation of the device. In addition, the oil absorption and flexibility of the nylon braided rope also make the absorption and coating of lubricating oil more uniform, further improving the lubrication effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Figure 1 is a structural schematic diagram of the guide assembly in the present application.

[0021] Figure 2This is a top view of the guide component in this invention.

[0022] Figure 3 for Figure 2 Sectional view at point AA.

[0023] Figure 4 for Figure 3 A magnified structural diagram at point B in the middle.

[0024] Figure 5 This is a side view of the vertical rod in this invention.

[0025] Figure 6 for Figure 5 A magnified structural diagram at point C.

[0026] Figure 7 This is a schematic diagram of the structure when the guide sleeve descends in this invention.

[0027] Figure label: 1. Upper mold; 11. Guide sleeve; 2. Lower mold; 21. Guide post; 3. Lubrication assembly; 31. Connecting ring; 32. Connecting rope; 33. Oil cavity; 4. Tensioning device; 41. Torsion spring; 42. Slider; 43. Vertical rod; 431. Vertical slide; 432. Inclined slide; 433. Gate plate; 5. Telescopic sleeve. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] like Figures 1-7 As shown, an electrical energy metering box production device is used for stamping dies for stamping the metal shell of an electrical energy metering box. The main body of the production device includes a lower die 2 fixed on the press worktable and an upper die 1 fixed on the press slide 42. The upper die 1 and the lower die 2 are precisely guided by guide components set at four corner positions. Each guide component includes a robust guide post 21 and a guide sleeve 11 that fits precisely with it. The guide post 21 is vertically fixed on the lower die 2 and is usually made of 20CrMnTi carburized and quenched steel with extremely high surface hardness and has been finely ground to withstand high-frequency friction. The guide sleeve 11 is fixed on the upper die 1 and has a copper alloy wear-resistant layer embedded in its inner hole. An automatic lubrication and cleaning system is set on the guide components. On the lower die 2, an annular groove, i.e., an oil cavity 33, is provided around the root of each guide post 21. The cavity is filled with high-viscosity extreme pressure lubricating oil to provide a lubricating medium for the entire system.

[0030] The lubricating system is composed of a lubricating assembly 3 and a mechanical mechanism for controlling the movement of the lubricating assembly 3. The lubricating assembly 3 includes a connecting ring 31 sleeved outside the lower end of the guide sleeve 11. The connecting ring 31 can rotate freely relative to the guide sleeve 11, but its axial position is limited by a snap spring or a step, so that it moves up and down with the guide sleeve 11. The lower edge of the connecting ring 31 is uniformly provided with a plurality of hooks or hole positions. A plurality of connecting ropes 32 are fixed at the lower edge of the connecting ring 31 at one end, and extend downward and are fixed on the inner wall of the bottom of the oil cavity 33 at the other end, or are fixed on a stationary compression ring in the oil cavity 33. The connecting ropes 32 are made of nylon braided rope. When the upper die 1 descends to the dead point, i.e. in the closed die state, the connecting ropes 32 are in a relaxed and curved state, and most of the rope body is immersed in the lubricating oil in the oil cavity 33. When the upper die 1 ascends to the upper dead point, i.e. in the open die state and the connecting ring 31 is not rotated, the connecting ropes 32 are in a spiral and slightly relaxed state. By utilizing the excellent oil absorption property (capillary effect) of the nylon braided rope, the connecting ropes 32 can absorb sufficient lubricating oil when they are immersed and relaxed.

[0031] In order to realize dynamic lubricating oil coating, the connecting ropes 32 must be closely attached to the guide pillar 21 at a certain moment. This is achieved by a tightening assembly and a control assembly. The tightening assembly mainly includes a torsion spring 41 installed between the connecting ring 31 and the guide sleeve 11. One end of the torsion spring 41 is inserted into the hole of the guide sleeve 11, and the other end is inserted into the hole of the connecting ring 31. The pre-tightening force of the torsion spring 41 tends to reset the connecting ring 31 to a "tight state", i.e. the connecting ropes 32 are wound around the guide pillar 21. That is, the connecting ring 31 can make the connecting ropes 32 tightly wound around the guide pillar 21 under the elastic action of the torsion spring 41. The resetting is achieved by the control assembly. The control assembly is used to forcibly drive the rotation of the connecting ring 31. The control assembly includes a slider 42 (which can be a roller or a slide pin, and the number is preferably two, and is symmetrically arranged with the axis of the connecting ring 31) arranged on the outer sidewall of the connecting ring 31, and a firm vertical rod 43 (the number of vertical rods 43 is the same as the number of sliders 42) fixed on the lower die 2. The height of the vertical rod 43 covers the entire stroke of the die, and the inner side, i.e. the side facing the guide pillar 21, is provided with a track groove cooperating with the slider 42, including a vertical slide 431 and an inclined slide 432. The vertical slide 431 is a straight groove, and the direction is parallel to the punching direction. The inclined slide 432 is a plurality of inclined grooves located on one side of the vertical slide 431. The bottom end of the inclined slide 432 is connected to the vertical slide 431. The top ends of all inclined slides 432 are arranged in an arc along the rotation direction of the guide sleeve 11. This can make the slider 42 more smoothly enter the vertical slide 431 from the inclined slide 432 during the rotation process of the connecting ring 31, further optimizing the process of storing and releasing the force of the torsion spring 41, and improving the stability and reliability of the entire lubricating assembly 3. The intersection of the inclined slide 432 and the upper part of the vertical slide 431 is provided with a switching assembly, which includes a shutter 433, i.e. a movable tongue, the top end of which is hinged to the slide wall through a hinge shaft, so that it can swing like a one-way door, and the bottom end of which is wedge-shaped. At the bottom of the groove of the vertical slide 431, a magnet is embedded corresponding to the closed position of the shutter 433. The shutter 433 is made of ferromagnetic material or inlaid with iron sheet, and under the action of no external force, the magnet attracts the shutter 433, making it tightly adhere to the groove bottom. At this time, the wedge-shaped bottom end of the shutter 433 just blocks the passage of the inclined slide 432, forming a "straight path" that can guide the slider 42 to the vertical sliding top when moving from below to above the vertical slide 431. When the slider 42 moves downward along the inclined slide 432, the slider 42 abuts against the shutter 433, causing the shutter 433 to rotate, so that the slider 42 enters the vertical slide 431 to continue moving downward. The helix angle of the inclined slide 432 is designed to be 30°-50°, which can ensure sufficient rotational driving force and prevent the slider 42 from being stuck.

[0032] A telescopic sleeve 5 for shielding sundries can be installed outside the guide assembly, which is usually made of flexible materials such as rubber or plastic, and is provided with spiral elastic metal wires. One end of the telescopic sleeve 5 is fixed to the upper die 1, and the other end is detachably installed on the lower die 2. During the opening and closing of the mold, the telescopic sleeve 5 will expand and contract, preventing metal chips, dust, stamping waste and other sundries from entering the inside of the guide assembly, and further protecting the normal work of the guide column 21 and the guide sleeve 11.

[0033] The complete working cycle of the device in actual production is as follows: In the initial state, i.e. the bottom dead center or closed mold state, the upper die 1 is located at the lowest position, and the guide sleeve 11 is located at the bottom of the guide column 21. At this time, the slider 42 on the connecting ring 31 moves along the vertical slide 431 at the bottom of the vertical rod 43, and the torsional spring 41 is "tightened" and in a charged state. This rotational position of the connecting ring 31 causes the connecting rope 32 to be in a relaxed state, so that the connecting rope 32 becomes relaxed and curved, and is completely soaked in the hot oil in the oil cavity 33. By taking advantage of the excellent oil absorption (capillary effect) of the nylon woven rope, the connecting rope 32 absorbs sufficient lubricating oil in this stage.

[0034] Subsequently, the mold opening stroke is entered, the upper die 1 is driven by the press to rise, the guide sleeve 11 drives the connecting ring 31 and the slider 42 thereon to rise. When the upper die 1 rises to the maximum height, the slider 42 is separated from the vertical slide 431, and the torsional spring 41 in the force storage state begins to release energy, the torsional spring 41 drives the connecting ring 31 to rotate positively relative to the guide sleeve 11, with the rotation of the connecting ring 31, the upper end point of the connecting rope 32 is angularly displaced relative to the lower end point, the originally relaxed connecting rope 32 is tightened in a spiral shape, and then shrinks to the center, tightly wraps and adheres to the cylindrical surface of the guide column 21. At this time, the surface of the guide column 21 is tightly wrapped with the connecting rope 32 and filled with lubricating oil.

[0035] Then, the mold closing stroke, i.e. the descending stamping process, is entered, the upper die 1 begins to descend, the guide sleeve 11 descends accordingly, the slider 42 enters the inclined slide groove, with the slider 42 sliding downward along the inclined slide 432, the connecting ring 31 gradually moves reversely to store energy for the torsional spring 41, and the connecting rope 32 is gradually loosened, when the slider 42 abuts against the shutter 433, the shutter 433 rotates to open, the slider 42 smoothly enters the vertical slide 431 from the inclined slide 432 to continue downward movement, and the torsional spring 41 is again "tightened" to be in the force storage state, the connecting rope 32 becomes relaxed and curved again, and is re-immersed in the hot oil in the oil cavity 33, to prepare for adsorbing lubricating oil for the next mold opening stroke.

[0036] In the entire working cycle, the device can automatically adjust the state of the connecting rope 32 according to the opening and closing state of the mold, realize dynamic lubricating oil coating, in the mold opening, the connecting rope 32 adsorbs lubricating oil and winds on the guide column 21 to provide sufficient lubrication for the guide column 21; in the mold closing, the connecting rope 32 is loosened and re-immersed in the oil to prepare for the next lubrication. This automatic lubrication mode can effectively solve the problems of insufficient lubrication of the guide column 21, short oil film maintenance time, difficult manual oiling, uneven lubrication leading to accelerated wear of the guide column 21 and guide sleeve 11, decreased guiding accuracy and shortened mold life in the related art.

[0037] At the same time, the structure of the device is relatively simple, does not need complex processing and oil circuit design, and avoids the problem of oil circuit blockage. Moreover, by reasonably designing the helix angle of the inclined slide 432 and the switching assembly, it can be ensured that the slider 42 will not be stuck during movement, and stable operation of the device is ensured. In addition, the oil absorption and flexibility of the nylon woven rope also make the adsorption and coating of the lubricating oil more uniform, further improving the lubrication effect.

[0038] According to the hydrodynamic lubrication theory, the oil film thickness between the guide pillar 21 and the guide sleeve 11 is proportional to the relative sliding speed and the viscosity of the lubricating oil, and inversely proportional to the load. In the traditional mold, as the stroke goes down, the upper oil flow is lost, the oil film thickness rapidly decreases, and even tends to zero, resulting in dry friction. In the present application, the energy released by the torsion spring 41 is used to fully coat the guide pillar 21 with oil during each stroke, which is equivalent to forcibly resetting the maximum oil film thickness at the initial moment. The oil change cycle is extended from once per shift manual refueling to once every 2-4 weeks to supplement the oil cavity 33. The connecting rope 32 is preferably made of oil-containing nylon 66 (PA66) fiber, which can be mixed with a small amount of cotton fiber to increase oil absorption. The diameter is about 3mm, and the lubricating oil is ISO VG 68 or 100 guide rail oil, which has good adhesion and anti-climbing properties.

[0039] The existing electric energy metering box usually includes a box assembly, an internal electrical installation system and a safety protection system. The box assembly serves as a whole support and protection carrier, which is usually made of stainless steel plate, cold-rolled steel plate or SMC (Sheet Molding Compound), polycarbonate (PC) and other insulating and flame-retardant materials. The surface of the box is electrostatically sprayed or specially treated to ensure that it has excellent ultraviolet resistance, corrosion resistance and anti-aging performance in outdoor harsh environments. The front of the box is hingedly connected with a box door, and a sealing rubber strip is arranged between the box door and the box. When the box door is closed, the sealing rubber strip is deformed under pressure to achieve waterproof and dustproof. The protection level is usually designed to meet the IP44 or IP54 standard. In the position corresponding to the internal electric energy meter display screen of the box door, a transparent window is inlaid. The window material is mainly weather-resistant polycarbonate or tempered glass, so that the inspection personnel can clearly read the electric energy data without opening the box door. In order to prevent unauthorized opening, a special padlock hole device and a pick-resistant lead seal position are arranged on the box door. Some intelligent metering boxes also have a door opening alarm contact switch inside the door frame. Once the box door is opened illegally, the system will send an alarm signal to the background. In addition, labyrinth-type ventilation windows are usually provided on both sides or the bottom of the box, which can ensure internal air convection and heat dissipation, and prevent rainwater splashing and foreign matter intrusion.

[0040] In the internal space layout of the box, the insulation partition is usually used to divide it into three independent electrical function areas of incoming line room, metering room and outgoing line room. The power supply incoming line is introduced into the incoming line room through the incoming line hole at the bottom of the box, and the total incoming line switch is installed in the incoming line room. The switch is usually selected from molded case circuit breaker or disconnecting switch, and is fixed on the installation base plate or guide rail, which is responsible for the on-off control of the entire metering box power supply. For large current specification metering box, current transformer is also installed in the incoming line room, which is used to convert the primary side large current into secondary side small current for metering. After the power supply flows through the total switch, it extends to the metering room through copper or aluminum insulated busbar, and the surface of the busbar is wrapped with yellow, green and red heat shrink sleeve to clearly distinguish the phase sequence. The metering room is located in the middle core position of the box, and the single-phase or three-phase electric energy meter is fixed on the installation base plate inside the metering room. The terminal of the electric energy meter is electrically connected with the busbar and the sampling line for accurate cumulative metering of the flowing electric energy. In the smart grid application scenario, the metering room also reserves installation position and integrates data acquisition terminal or concentrator. The terminal is connected with the electric energy meter through RS485 interface or carrier communication, and the metering data is uploaded to the power master station in real time through wireless public network or optical fiber network, realizing remote meter reading and power consumption monitoring function.

[0041] The metered electric energy line enters the outgoing line room, and the outgoing line room is provided with branch outgoing line switches for each user circuit, usually selected from miniature circuit breaker or residual current protection switch. These switches not only bear the task of distributing electric energy to the rear end load, but also integrate overload protection, short circuit protection and residual current protection functions, which can automatically cut off the circuit in milliseconds when abnormality occurs in the user side circuit, preventing electrical fire and electric shock accident. The lower part of the outgoing line room is also provided with a ground terminal row and a zero line terminal row for connecting the protective ground wire and the working zero line, forming a complete grounding protection system. Through the above structural layout, the electric energy metering box realizes the whole process function from power supply introduction, electric energy metering, data acquisition to electric energy distribution and safety protection, ensuring the accuracy of power trade settlement and the safe and stable operation of power supply and consumption system.

[0042] In the stamping production of the above-mentioned electric energy metering box, the mold guide system is perfectly lubricated and cooled, the gap between the guide pillar 21 and the guide sleeve 11 is always kept in the best matching state without thermal deformation, which makes the centering degree of the upper and lower molds 2 in the stamping process extremely high, and the produced metering box has high precision of stretching size, the depth of the box body is uniform in wall thickness without cracking or excessive thinning, which ensures the structural strength and protection level of the box body. At the same time, the edge of the stamped part is flat, the edge collapse angle of the punched and blanked part is small, the proportion of bright band is high, and there is no obvious burr, which greatly reduces the workload of subsequent workers for polishing and deburring.

[0043] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that variations, modifications, substitutions and changes can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. An electric energy metering box production device comprising a punch die including an upper die (1) and a lower die (2), a plurality of guide assemblies being installed between the upper die (1) and the lower die (2), characterized in that, The guiding assembly comprises: a guide column (21) fixedly installed on the lower die (2), and an oil cavity (33) provided around the position of the bottom of the guide column (21) on the lower die (2), and the oil cavity (33) filled with lubricating oil; a guide sleeve (11) fixedly installed on the upper die (1) and in sliding cooperation with the guide column (21); a lubricating assembly (3) comprising a connecting ring (31) and a plurality of connecting ropes (32), both ends of the connecting rope (32) connected with the bottom of the connecting ring (31) and the bottom of the oil cavity (33) respectively, and the connecting ring (31) rotatably installed on the bottom of the guide sleeve (11), and when the guide sleeve (11) is at the lowest height, the connecting rope (32) is immersed in the lubricating oil; a tightening assembly installed between the connecting ring (31) and the guide sleeve (11), and when the guide sleeve (11) rises to the maximum height, the tightening assembly rotates the connecting ring (31) relative to the guide sleeve (11), so that the connecting rope (32) is in contact with the guide column (21).

2. The electric energy metering box production device according to claim 1, characterized in that, The material of the connecting rope (32) is nylon woven rope.

3. The electric energy metering box production device according to claim 2, characterized in that, The tightening device (4) comprises a torsion spring (41) and a control assembly for controlling the release and storage of the torsion spring (41), and the torsion spring (41) is installed between the guide sleeve (11) and the connecting ring (31).

4. The electric energy metering box production device according to claim 3, characterized in that, The control assembly comprises a sliding block (42) provided on the connecting ring (31) and a vertical rod (43) fixedly installed on the lower die (2), and the vertical rod (43) is provided with a vertical sliding channel (431) in the vertical direction, one side of the vertical sliding channel (431) is provided with an inclined sliding channel (432) capable of communicating with the vertical sliding, and the communication is provided with a switching assembly, and when the sliding block (42) rises, the switching assembly is in a closed state, preventing the sliding block (42) from entering the inclined sliding channel (432), and when the sliding block (42) slides downward along the inclined sliding channel (432), the switching assembly is switched to a separated state, so that the sliding block (42) enters the vertical sliding channel (431) from the inclined sliding channel (432).

5. The electric energy metering box production device according to claim 4, characterized in that, The number of the inclined sliding channels (432) is multiple, and the top ends of all the inclined sliding channels (432) are arranged in an arc along the rotation direction of the guide sleeve (11).

6. The electric energy metering box production device according to claim 5, characterized in that, The switching assembly comprises a shutter (433), and the top end of the shutter (433) is hinged to the vertical sliding channel (431), and the hinge is located above the intersection of the inclined sliding channel (432) and the vertical sliding channel (431).

7. The electric energy metering box production device according to claim 6, characterized in that, The bottom end of the shutter (433) is wedge-shaped, and the vertical sliding channel (431) is provided with an embedding groove corresponding to the position of the shutter (433), and when the shutter (433) is in a closed state, the shutter (433) is located in the embedding groove.

8. The electric energy metering box production device according to claim 7, characterized in that, The bottom end of the shutter (433) is magnetically connected with the vertical sliding channel (431).

9. The electric energy metering box production device according to claim 8, characterized in that, The vertical sliding channel (431) is provided with a magnet capable of attracting the shutter (433).

10. An electricity metering box, characterized in that The shell of the electric energy metering box is machined by the electric energy metering box production device of claims 1-9.

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