A car charging pile tooling production line conveying device

Abstract

The utility model relates to automobile charging pile frock production line conveying technical field discloses a kind of automobile charging pile frock production line conveying device, wherein automobile charging pile frock production line conveying device includes tray support subassembly, differential leveling assembly, variable-distance distribution assembly and stop and variable-distance control assembly.To tray support subassembly includes tray chassis, two telescopic support feet, spherical universal support and guide roller pair;Differential leveling assembly includes two vertical leadscrews, two screw nut seats, two pairs of bevel gears, differential half shaft pair and differential planetary carrier, the equal adjustment of two support feet is realized by differential, and tray self-leveling is realized;Variable-distance distribution assembly includes side slot wheel, dial and dial round pin, and the intermittent indexing of tray queue is realized;Stop and variable-distance control assembly includes stop lever and tray side stop block, the utility model realizes inbound self-leveling and inter-station variable-distance buffer by pure mechanical structure, and improves rhythm and stability.

Description

Technical Field

[0001] This utility model relates to the field of conveying technology in automotive charging pile tooling production line, and more specifically, it relates to a conveying device for automotive charging pile tooling production line. Background Technology

[0002] In the pallet conveying process of the electric vehicle charging pile tooling production line, it is necessary to achieve pallet leveling upon entry into the workstation and buffering between stations. Existing technologies typically use chain plate or roller conveyor lines, with electric lifting platforms for entry leveling. The pallet pitch is fixed, and buffering between stations relies on the accumulation section. However, existing chain plate or roller conveyor structures are prone to frequent maintenance and slow response during long-term operation. Furthermore, when the tooling's center of gravity is off-center, the pallet's entry posture becomes unstable, affecting the positioning and consistency of processes such as potting, tightening, and pressure testing. In addition, the fixed pitch limits the release conditions at the workstation entrances and exits, resulting in insufficient buffering capacity and susceptibility to blockages at high-speed operation. Therefore, how to achieve self-leveling upon entry and variable-pitch buffering between stations through a purely mechanical structure without introducing an electronic control system, thereby improving cycle time and stability, has become a pressing technical problem to be solved. Utility Model Content

[0003] This utility model provides a conveying device for a car charging pile tooling production line, which solves the technical problem in related technologies of how to achieve self-leveling at the station and variable pitch buffering between stations through a purely mechanical structure without introducing an electronic control system, thereby improving cycle time and stability.

[0004] This utility model discloses a conveying device for a car charging pile tooling production line, including: The pallet support assembly includes a pallet base frame, two retractable support legs that can extend and retract relative to the pallet base frame in the vertical direction, a spherical universal support, and a guide roller pair; the spherical universal support is fixedly connected to the pallet base frame, and the guide roller pair is movably connected to the pallet base frame and can cooperate with the production line track; The differential leveling assembly includes two vertical lead screws, two lead screw nut seats, two pairs of bevel gears, a differential half-shaft pair, and a differential planetary carrier. The two vertical lead screws are threaded into the two lead screw nut seats, which are fixedly connected to the tray base. The rotational motion of the vertical lead screws can be converted into the vertical linear motion of the retractable support legs. The top of each vertical lead screw is fixedly connected to the driven gear in one of the bevel gear pairs, and the driving gears of the bevel gears are fixedly connected to the left and right half-shafts of the differential. The two half-shafts of the differential are movably connected to the differential planetary carrier and follow a differential relationship. When the planetary carrier rotates, based on the difference in contact pressure between the two support legs and the reference plane, the two half-shafts drive the two vertical lead screws to rotate in opposite directions by equal amounts through bevel gear transmission until the contact pressure between the two support legs and the reference plane tends to be equal, thus achieving self-leveling of the tray relative to the reference plane. A variable pitch distribution assembly includes a side-mounted grooved wheel, a dial, and a dial pin. The side-mounted grooved wheel is fixedly connected to the production line base via a support. The grooved wheel disc has slots distributed radially, penetrating both sides of the disc, with multiple slots evenly distributed along the circumference of the wheel. The dial is fixedly connected to the production line drive shaft via a support, and the dial pin is fixedly connected to the dial. During the rotation of the dial, the dial pin periodically inserts into the slots, driving the side-mounted grooved wheel to rotate intermittently. The stop and pitch control assembly includes a stop lever and a pallet side stop block. The stop lever is distributed along the circumference of the grooved wheel and is fixedly connected to the grooved wheel disc body. The pallet side stop block is fixedly connected to the pallet base frame. When the side-mounted grooved wheel is in the locked position, the stop lever contacts the pallet side stop block and blocks the pallet from moving forward. When the side-mounted grooved wheel rotates at indexing intervals, the stop lever rotates with the grooved wheel to make way, the side stop block of the foremost pallet disengages from the stop lever, and the foremost pallet continues to move forward. At the same time, the next stop lever rotates to the stop position to block the subsequent pallet. The distance the foremost pallet moves within the time of two indexing intervals forms the adjusted center distance between adjacent pallets.

[0005] Furthermore, it also includes a power coupling assembly, which comprises a spline joint and a spline sleeve; the spline joint is detachably connected to the station drive shaft, and the spline sleeve is fixedly connected to the differential planetary carrier; when the pallet enters the station, the spline joint engages with the spline sleeve, and the rotational motion of the station drive shaft is transmitted to the differential planetary carrier; when the pallet leaves the station, the spline joint separates from the spline sleeve.

[0006] Furthermore, the two vertical lead screws are trapezoidal lead screws or ball screws; the lower end of the vertical lead screw is movably connected to the pallet base frame through a thrust bearing, and the thrust bearing bears the axial load when the lead screw rotates and reduces the frictional resistance between the lead screw and the pallet base frame during the leveling process.

[0007] Furthermore, the ends of the two retractable support legs are provided with hemispherical support heads. The hemispherical support heads are detachably connected to the end of the vertical lead screw via ball sockets. The spherical surface of the hemispherical support head contacts the reference plane and can rotate within a limited angle within the ball socket to adapt to local posture changes of the reference plane.

[0008] Furthermore, a guide transition curve is provided at the end of the slot, which realizes the acceleration and deceleration of the indexing motion of the side-mounted grooved wheel during the engagement and disengagement of the dial pin, and the guide transition curve is a slow-in and slow-out curve.

[0009] Furthermore, the stop and pitch control assembly also includes a Geneva wheel locking mechanism, which is movably connected to the Geneva wheel disc body and locks the position of the side Geneva wheel during the indexing gap to prevent the side Geneva wheel from rotating unexpectedly due to the pallet thrust.

[0010] Furthermore, the outer ring of the differential is provided with a torque limiting clutch ring, which is interference-fitted with the outer ring of the differential; when the transmitted torque exceeds a set value, the torque limiting clutch ring slides relative to the outer ring of the differential, limiting the torque transmitted to the vertical lead screw to below the set peak value.

[0011] Furthermore, a locking ring is provided outside the differential planetary carrier, and the locking ring is movably connected to the outer ring of the differential; when the pallet leaves the workstation, the locking ring moves to the locking position and engages with the locking groove on the differential planetary carrier to restrict the rotation of the differential planetary carrier, so that the relative position of the two vertical lead screws remains stable during conveying and indexing.

[0012] Furthermore, the spline joint and the station drive shaft are detachably slidable. The inner spline of the spline joint mates with the outer spline of the station drive shaft. The spline connection allows relative sliding in the axial direction and transmits torque in the circumferential direction.

[0013] Furthermore, the number of stops on the circumference of the grooved wheel is equal to the number of slots, and the angular distribution of the stops is consistent with the angular distribution of the slots. When the side-mounted grooved wheel rotates at the indexing interval, the stop at the original stop position moves aside, and the stop at the next stop position reaches the stop position. The displacement of the first pallet that is released during the duration of the adjacent indexing gap forms the adjusted pallet center distance.

[0014] This invention utilizes a counter-current equal-amount adjustment structure consisting of two vertical lead screws and a differential. During the entry stage, energy is directly provided by the workstation drive shaft. The differential relationship ensures that the contact pressure of the two support feet on the reference plane is nearly equal, solving the problem of posture instability caused by sluggish control response in existing electric lifting platforms. This achieves the technical effect of enabling the pallet to quickly adapt to the offset of the tooling's center of gravity and the unevenness of the reference plane during entry, thus improving the stability of the entry posture. Through the side-mounted grooved wheel stop and the indexing coordination of the dial, the indexing angle and center distance adjustment can be synchronized without relying on the sliding guide rail. The free travel within the two indexing gaps achieves variable pitch, solving the problem of limited release conditions in fixed-pitch accumulation sections under high-frequency operation. This achieves the technical effect of adjustable inter-station buffer capacity according to the indexing parameters, alleviating the congestion caused by insufficient buffer capacity. The dual protection mechanism of torque-limiting clutch ring and locking ring separates the leveling process from the conveying indexing process, solving the maintenance needs caused by overload and attitude disturbance, and achieving the technical effect of improving the reliability and consistency of the device in long-term operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the conveyor device in the production line for electric vehicle charging stations. Figure 1 ; Figure 2 This is a schematic diagram of the conveyor device in the production line for electric vehicle charging stations. Figure 2 ; Figure 3 This is a schematic diagram of the conveyor device in the production line for electric vehicle charging stations. Figure 3 ; Figure 4 This is a schematic diagram of the conveyor device in the production line for electric vehicle charging stations. Figure 4 ; Figure 5 yes Figure 4 Enlarged view of point A; Figure 6 This is a schematic diagram of the conveyor device in the production line for electric vehicle charging stations. Figure 5 ; Figure 7 yes Figure 6 Enlarged view of point B. Detailed Implementation

[0016] According to an embodiment of this invention, for pallet conveying in a charging pile tooling production line 1, existing chain or roller conveyor lines typically achieve in-station leveling via an electric lifting platform, with a fixed pallet pitch and inter-station buffering relying on an accumulation section. Existing chain or roller conveyor structures are prone to frequent maintenance and slow response during long-term operation. Furthermore, when the tooling's center of gravity is offset, the pallet's in-station posture becomes unstable, affecting the positioning and consistency of processes such as potting, tightening, and pressure resistance. In addition, the fixed pitch restricts release conditions at workstation entrances and exits, resulting in insufficient buffering capacity and a tendency to cause blockages at high speeds. The pallet conveying device proposed in this embodiment aims to achieve in-station self-leveling and inter-station variable pitch buffering through a purely mechanical structure without introducing an electronic control system, thereby improving speed and stability.

[0017] like Figure 1-7 As shown in the embodiment, according to this implementation, the conveying device of the car charging pile tooling production line is functionally divided into a pallet support assembly, a differential leveling assembly, a power coupling assembly, a pitch distribution assembly, and a stop and pitch control assembly. These components are mechanically connected to form a complete conveying and leveling system.

[0018] The conveying device for the automotive charging pile tooling production line provided in this embodiment includes at least a differential leveling component, a pitch distribution component, and a tray support component, which together constitute the simplest structure for realizing in-station self-leveling and pitch buffering.

[0019] The pallet support assembly is used to support the tooling and guide the conveyor line. The pallet support assembly includes a pallet base 2, two retractable support legs 3, a spherical universal support, and a guide roller assembly 4. The pallet base 2 is a rigid frame structure that bears the load of the tooling. The two retractable support legs 3 are fixedly connected to the pallet base 2 via their respective screw and nut seats. The screws of the retractable support legs 3 are movably connected to the pallet base 2, allowing them to extend and retract relative to the pallet base 2 in the vertical direction. The spherical universal support is fixedly connected to the pallet base 2 via a support seat. The spherical contact surface of the spherical universal support can adapt to the attitude changes of the reference plane in multiple directions, forming a three-point support configuration together with the two retractable support legs 3. The guide roller assembly 4 is movably connected to the pallet base 2. The roller surface of the guide roller assembly 4 mates with the track of the production line 1. The guide roller assembly 4 rolls along the track during conveying, guiding the pallet along the conveying direction.

[0020] The differential leveling assembly is used to adjust the pallet support height in opposite directions and by equal amounts during workstation entry, achieving self-leveling of the reference plane. The differential leveling assembly includes two vertical lead screws 5, two lead screw nut seats 6, two pairs of bevel gear sets 8, a differential 7 half-shaft pair, and a differential 7 planetary carrier. The two vertical lead screws 5 are threaded into the two lead screw nut seats 6, which are fixedly connected to the pallet base 2. The rotational motion of the vertical lead screws 5 is converted into the vertical linear motion of the retractable support legs 3 through the threaded pair. The top of each vertical lead screw 5 is fixedly connected to the driven gear in a pair of bevel gear sets 8, and the driving gears of the bevel gear sets 8 are fixedly connected to the left and right half-shafts of the differential 7. The two half-shafts of the differential 7 are movably connected to the differential 7 planetary carrier, and the planetary carrier and the two half-shafts follow a differential relationship. ,in and These are the angular velocities of the left and right half-axis, respectively. Let be the angular velocity of the planetary carrier. When the planetary carrier moves at an angular velocity... During rotation, based on the difference in contact pressure between the two retractable support legs and the reference plane, the two half-shafts respectively rotate at... and The rotation, driven by the bevel gear set 8, causes the two vertical lead screws 5 to rotate in opposite directions with equal amounts until the contact pressure of the two retractable support legs 3 against the reference plane becomes equal. The tray achieves self-leveling relative to the reference plane.

[0021] The power coupling assembly detachably transmits the rotational motion of the station drive shaft to the differential 7 planetary carrier. The power coupling assembly includes a splined joint and a splined sleeve. The splined joint is detachably connected to the station drive shaft, and the splined sleeve is fixedly connected to the differential 7 planetary carrier. When the pallet enters the station, the splined joint and splined sleeve engage, and the rotational motion of the station drive shaft is transmitted to the differential 7 planetary carrier via the splined joint and splined sleeve, driving the differential leveling assembly. When the pallet leaves the station, the splined joint and splined sleeve disengage, the differential 7 planetary carrier is released from the constraint of the station drive shaft, and the pallet can move freely in the conveyor section.

[0022] The variable pitch distribution assembly is used to achieve intermittent indexing and center distance adjustment of the pallet queue. Located on the side of the conveyor belt, the assembly includes a side-mounted grooved wheel 9, a dial 10, and a dial pin. The side-mounted grooved wheel 9 is fixedly connected to the base of production line 1 via a support, and slots are formed on the wheel disc. These slots are radially distributed strip-shaped channels that penetrate both sides of the wheel disc, with multiple slots evenly distributed along the circumference of the wheel. The dial 10 is fixedly connected to the drive shaft of production line 1 via a support, and rotates continuously with the drive shaft. The dial pin is fixedly connected to the dial 10, and periodically inserts into the slot of the side-mounted grooved wheel 9 during the rotation of the dial 10. The dial pin engages with the slot, pushing the side-mounted grooved wheel 9 at the indexing angle. Intermittent rotation, where n is the number of slots on the circumference of the Geneva wheel. A guide transition curve is provided at the end of the slot, which accelerates or decelerates the indexing motion during the engagement and disengagement of the dial pin.

[0023] The stop and pitch control assembly is used to achieve stop-and-go pitch control of the pallet. The assembly includes a stop bar, pallet side blocks, and a pulley locking mechanism. The stop bar is distributed along the circumference of the pulley and is fixedly connected to the pulley body. The pallet side blocks are fixedly connected to the pallet base 2 and are located on the side of the pallet along the conveying direction. When the side pulley 9 is in the locked position, the stop bar extends and contacts the pallet side blocks, blocking the forward movement of the foremost pallet. When the side pulley 9 rotates to index, the stop bar rotates with the side pulley 9 to make way, the pallet side blocks of the foremost pallet disengage from the stop bar, and the foremost pallet continues to move forward under the drive of the conveyor belt. Simultaneously, the next stop bar rotates to the stop position, blocking the pallet side blocks of subsequent pallets. Within the time interval of two indexing intervals, the distance the foremost pallet moves at a conveying speed v is... ,in The time interval between adjacent divisions. The equivalent angular velocity of the lower-side grooved wheel 9 driven by the dial 10. (This is achieved through the indexing angle.) To match the conveyor speed v, the center distance between adjacent pallets is adjusted to the target value. This achieves variable pitch buffering. The Geneva wheel locking mechanism locks the position of the side Geneva wheel 9 during the indexing gap. The Geneva wheel locking mechanism is movably connected to the Geneva wheel disc body to prevent the side Geneva wheel 9 from rotating unexpectedly due to the pallet thrust during the stop.

[0024] In some embodiments, the differential 7 is a bevel gear differential. The two half-shafts of the differential 7 are respectively fixedly connected to the driving gears of two pairs of bevel gear sets 8 via key connections, ensuring reliable torque transmission. The module and number of teeth of the bevel gear sets 8 are matched according to the target adjustment speed ratio of the two vertical lead screws 5. The transmission ratio of the bevel gear sets 8 determines the conversion relationship between the planetary carrier angular velocity and the rotational speed of the two vertical lead screws 5. The selection of the transmission ratio should meet the process requirements of leveling time and stroke.

[0025] In some embodiments, the two vertical lead screws 5 are trapezoidal lead screws or ball screws. The trapezoidal lead screw is fixedly connected to the lead screw nut seat 6 via a threaded joint, which has a self-locking characteristic, enabling it to maintain the height position of the support feet after leveling. The ball screw is threadedly engaged with the lead screw nut seat 6 via balls. The ball screw has a higher transmission efficiency than the trapezoidal lead screw, reducing the drive torque requirement during leveling. The lower end of the vertical lead screw 5 is movably connected to the pallet base 2 via a thrust bearing. The thrust bearing bears the axial load during the rotation of the vertical lead screw 5, reducing the frictional resistance between the vertical lead screw 5 and the pallet base 2 during leveling and improving the leveling response speed.

[0026] In some embodiments, hemispherical support heads are provided at the ends of the two retractable support legs 3. The hemispherical support heads are detachably connected to the end of the vertical lead screw 5 via ball sockets, and the spherical surface of the hemispherical support heads contacts the reference plane. When there is a slight unevenness in the reference plane, the hemispherical support heads can rotate within a limited angle in the ball sockets, so that the contact surface can conform to the local posture of the reference plane and avoid the concentration of contact pressure caused by rigid contact.

[0027] In some embodiments, the side-mounted grooved wheel 9 is an integrated disc structure. The slots are evenly distributed along the radial direction on the grooved wheel disc, and the angular interval between adjacent slots is equal to the graduation angle. A rounded transition section is provided at the end of the slot. The rounded transition section provides guidance when the dial pin engages with the slot. The rounded transition section reduces the impact between the dial pin and the edge of the slot, thereby reducing vibration and noise during the indexing process.

[0028] In some embodiments, the spline joint and the station drive shaft are in a sliding, detachable connection. The internal spline of the spline joint mates with the external spline of the station drive shaft, allowing relative sliding in the axial direction and transmitting torque in the circumferential direction. When the pallet enters the station, the spline joint slides axially into the external spline of the station drive shaft, achieving rapid engagement. When the pallet leaves the station, the spline joint disengages axially from the external spline of the station drive shaft, automatically separating. The sliding spline connection allows the pallet to move continuously on the conveyor line without being constrained by the station drive shaft during transport.

[0029] Furthermore, to prevent overload damage during the leveling process, a torque-limiting clutch ring is installed on the outer ring of the differential 7. The torque-limiting clutch ring and the outer ring of the differential 7 are interference-fitted, and the torque-limiting clutch ring rotates synchronously with the outer ring of the differential 7 under normal operating torque. When the transmitted torque exceeds the set value, the friction between the torque-limiting clutch ring and the outer ring of the differential 7 is insufficient to maintain synchronization, causing the torque-limiting clutch ring to slip relative to the outer ring of the differential 7. The torque transmitted to the vertical lead screw 5 is limited to below the set peak value. The set torque of the torque-limiting clutch ring is calculated and determined based on the maximum load and eccentricity of the tooling. The torque-limiting clutch ring prevents overload of the differential leveling components caused by instantaneous uneven load on the tooling or obstructions on the reference plane, thus improving the durability of the device.

[0030] Furthermore, to maintain the achieved leveling height during the conveying and indexing stages, a locking ring is installed on the outside of the differential 7 planetary carrier. The locking ring is movably connected to the outer ring of the differential 7. During pallet leveling upon entry, the locking ring is in a disengaged position, allowing the differential 7 planetary carrier to rotate freely. When the pallet leaves the workstation, the locking ring moves to the locked position, engaging with the locking groove on the differential 7 planetary carrier, thus restricting the rotation of the differential 7 planetary carrier relative to the outer ring. After the differential 7 planetary carrier is locked, the relative positions of the two vertical lead screws 5 remain stable, and the height configuration of the three-point support formed by the two telescopic support legs 3 and the spherical universal support does not change during conveying and indexing, avoiding secondary height adjustments that could affect the fit between the guide roller pair 4 and the production line 1 track.

[0031] Furthermore, to achieve synchronization between indexing and pitch change, a correspondence is established between the indexing angle position and the stop position of the side-mounted grooved wheel 9. The number of stop bars and the number of slots on the circumference of the grooved wheel are equal, both being n, and the angular distribution of the stop bars is consistent with the angular distribution of the slots. When the side-mounted grooved wheel 9 moves according to the step angle... During indexing, the stop lever rotates synchronously. The lever at the original stop position yields, and the lever at the next stop position reaches the stop position. The duration of adjacent indexing gaps is... During the duration T of the adjacent indexing gap, the displacement formed by the first released pallet moving forward at the conveying speed v. As the adjusted center distance. By selecting the transmission ratio between the dial 10 and the side-mounted slotted wheel 9, so that... satisfy To achieve the target center distance, the target center distance should simultaneously meet the requirements of preventing interference between adjacent pallets and the buffer capacity between stations, thus achieving consistency in the cycle time of indexing and pitch variation.

[0032] The steps to be performed; Leveling procedure upon entry: The pallet enters the workstation along the conveyor line. The spline joint of the power coupling assembly engages with the external spline of the workstation drive shaft. The workstation drive shaft drives the spline sleeve to rotate, and the spline sleeve drives the differential 7 planetary carrier to rotate at an angular velocity (c). The differential 7 planetary carrier drives the left and right half-shafts, which in turn drive two vertical lead screws 5 via bevel gear sets 8. The two vertical lead screws 5 rotate in opposite directions with equal magnitudes according to the differential relationship. The two vertical lead screws 5 drive two retractable support legs 3 to perform vertical extension and retraction movements through threaded pairs. When there is a difference in the contact pressure between the two retractable support legs 3 and the reference plane, the lead screw corresponding to the retractable support leg 3 with lower contact pressure rotates faster, and the retractable support leg 3 extends downward. The lead screw corresponding to the retractable support leg 3 with higher contact pressure rotates slower, and the retractable support leg 3 retracts upward. The adjustment process continues until the contact pressure between the two retractable support legs 3 and the reference plane is balanced, and the pallet reaches a stable leveling posture relative to the reference plane.

[0033] Departure and Indexing Steps: After completing the work at the station, the pallet leaves the station. The spline joint of the power coupling assembly disengages axially from the external spline of the station drive shaft, and the planetary carrier of the differential 7 disengages from the drive of the station drive shaft. Driven by the conveyor belt, the pallet moves along the conveying direction and enters the stopping area of ​​the side-mounted grooved wheel 9. The dial 10 rotates continuously with the drive shaft of production line 1. The dial pin on the dial 10 periodically inserts into the slot of the side-mounted grooved wheel 9, pushing the side-mounted grooved wheel 9 to rotate. The guide transition curve at the end of the slot causes the side-mounted grooved wheel 9 to accelerate and decelerate during the engagement and disengagement of the dial pin, and the side-mounted grooved wheel 9 rotates intermittently at the indexing angle. During the indexing rotation, the stop bar at the original stopping position rotates away from the pallet side stop block with the side-mounted grooved wheel 9, and the foremost pallet is removed from the stop bar's obstruction. At the same time, the next stop bar rotates to the stopping position, and the next stop bar contacts the pallet side stop block of the subsequent pallet, blocking the subsequent pallet.

[0034] Buffering and Release Procedure: Within the time interval of two indexing intervals, the first pallet released is driven by the conveyor belt and moves forward at a conveying speed, with a displacement of [value missing]. The original and subsequent pallets are blocked by the stop bar at the new stop position and held within the stop area. The center distance between adjacent pallets is adjusted due to the displacement of the first pallet. When the release conditions of the downstream station or conveying section are met, the dial pin is inserted into the slot of the side-mounted grooved wheel 9 again, and the side-mounted grooved wheel 9 performs the next indexing rotation, releasing a new first pallet. The pallets leave the buffer section according to the indexing cycle sequence and enter the downstream station or conveying section.

[0035] In some embodiments, the in-station leveling step further includes: when the torque transmitted by the outer ring of the differential 7 reaches the set value of the torque limiting clutch ring, the torque limiting clutch ring slips relative to the outer ring of the differential 7. The slippage of the torque limiting clutch ring limits the torque transmitted to the bevel gear set 8 and the vertical lead screw 5 to a set peak value, restricts the rotational speed of the vertical lead screw 5, and reduces the extension and retraction speed of the telescopic support leg 3. The torque limiting clutch ring prevents over-adjustment caused by momentary off-center loading of the tooling or obstruction of the reference plane, and avoids damage to the differential leveling assembly due to impact loads.

[0036] In some embodiments, the departure and indexing steps further include: after the pallet leaves the workstation, the locking ring outside the planetary carrier of the differential 7 moves to the locked position, and the locking ring engages with the locking groove on the planetary carrier of the differential 7, restricting the rotation of the planetary carrier of the differential 7 relative to the outer ring. After the planetary carrier of the differential 7 is locked, the left and right half shafts, the bevel gear set 8, and the two vertical lead screws 5 form a rigid connection, and the two vertical lead screws 5 maintain a constant relative position during indexing and conveying. The three-point support height configuration formed by the two retractable support feet 3 and the spherical universal support does not change during the conveying and indexing stages, the leveling posture of the pallet is maintained, and secondary height changes are avoided from affecting the guiding engagement between the guide roller pair 4 and the track of the production line 1.

[0037] In some embodiments, the buffering and release steps further include: the guide transition curve at the end of the slot of the side-mounted grooved wheel 9 adopts a slow-in, slow-out curve. At the beginning of the indexing interval, when the dial pin just contacts the end of the slot, the guide transition curve causes the angular velocity of the side-mounted grooved wheel 9 to gradually increase from zero, allowing the side-mounted grooved wheel 9 to start smoothly. At the end of the indexing interval, when the dial pin is about to disengage from the slot, the guide transition curve causes the angular velocity of the side-mounted grooved wheel 9 to gradually decrease to zero, allowing the side-mounted grooved wheel 9 to stop smoothly. The slow-in, slow-out curve reduces the impact force when the dial pin engages and disengages from the slot, reduces vibration during the indexing process, improves the stability of the pallet queue in the stopping area, and avoids pallet position deviation caused by impact.

[0038] Technical effects of this embodiment; Through a counter-current equal-amount adjustment structure consisting of two vertical lead screws 5 and a differential 7, energy is directly provided by the station drive shaft during the station entry stage, utilizing the differential relationship. The speed constraint ensures that the contact pressure of the two retractable support legs on the reference plane is equal. The opposing equal adjustment structure integrates the drive source for pallet posture adjustment into the workstation drive shaft, structurally eliminating the posture instability caused by the control response lag of existing electric lifting platforms. When the pallet enters the station, it can quickly adapt to the offset of the tooling center of gravity and the unevenness of the reference plane, improving the stability of the entering posture and ensuring the positioning consistency of processes such as potting, tightening, and pressure resistance.

[0039] By using the 9-position stop of the side-mounted grooved wheel and the indexing action of the dial 10, the indexing angle can be adjusted without relying on the sliding guide rail. Synchronized with the center distance adjustment, the pitch is varied by utilizing the free travel within the two indexing gaps. The indexing cooperation structure of the side-mounted grooved wheel 9-position stop and the dial 10 transforms the pitch adjustment of the inter-station buffer into a purely mechanical time-displacement conversion. Structurally, this replaces the factor that limits the release conditions under high-cycle conditions in the fixed-pitch accumulation section, making the inter-station buffer capacity adjustable with the indexing parameters. The blockage caused by insufficient buffer capacity is alleviated, and the release process has a controllable cycle.

[0040] The torque-limiting clutch ring is connected to the outer ring of the differential 7 via an interference fit. When the transmitted torque exceeds a set value, it slips, limiting the peak torque. The locking ring locks the planetary carrier of the differential 7 after the pallet leaves the station, keeping the two vertical lead screws 5 in a constant position. This dual protection mechanism of the torque-limiting clutch ring and the locking ring functionally separates the leveling process from the conveying and indexing process. Torque limitation during leveling prevents overload damage, while position locking during conveying and indexing prevents secondary adjustments. These two protection mechanisms structurally reduce maintenance requirements caused by overload and attitude disturbances, improving the reliability and consistency of the device during long-term operation and reducing the need for frequent maintenance.

Claims

1. A conveying device for a car charging pile tooling production line, characterized in that, include: The pallet support assembly includes a pallet base frame, two retractable support legs that can extend and retract relative to the pallet base frame in the vertical direction, a spherical universal support, and a guide roller pair; the spherical universal support is fixedly connected to the pallet base frame, and the guide roller pair is movably connected to the pallet base frame and can cooperate with the production line track; The differential leveling assembly includes two vertical lead screws, two lead screw nut seats, two pairs of bevel gears, a differential half-shaft pair, and a differential planetary carrier. The two vertical lead screws are threaded into the two lead screw nut seats, which are fixedly connected to the tray base. The rotational motion of the vertical lead screws can be converted into the vertical linear motion of the retractable support legs. The top of each vertical lead screw is fixedly connected to the driven gear in one of the bevel gear pairs, and the driving gears of the bevel gears are fixedly connected to the left and right half-shafts of the differential. The two half-shafts of the differential are movably connected to the differential planetary carrier and follow a differential relationship. When the planetary carrier rotates, based on the difference in contact pressure between the two support legs and the reference plane, the two half-shafts drive the two vertical lead screws to rotate in opposite directions by equal amounts through bevel gear transmission until the contact pressure between the two support legs and the reference plane tends to be equal, thus achieving self-leveling of the tray relative to the reference plane. A variable pitch distribution assembly includes a side-mounted grooved wheel, a dial, and a dial pin. The side-mounted grooved wheel is fixedly connected to the production line base via a support. The grooved wheel disc has slots distributed radially, penetrating both sides of the disc, with multiple slots evenly distributed along the circumference of the wheel. The dial is fixedly connected to the production line drive shaft via a support, and the dial pin is fixedly connected to the dial. During the rotation of the dial, the dial pin periodically inserts into the slots, driving the side-mounted grooved wheel to rotate intermittently. The stop and pitch control assembly includes a stop lever and a pallet side stop block. The stop lever is distributed along the circumference of the grooved wheel and is fixedly connected to the grooved wheel disc body. The pallet side stop block is fixedly connected to the pallet base frame. When the side-mounted grooved wheel is in the locked position, the stop lever contacts the pallet side stop block and blocks the pallet from moving forward. When the side-mounted grooved wheel rotates at indexing intervals, the stop lever rotates with the grooved wheel to make way, the side stop block of the foremost pallet disengages from the stop lever, and the foremost pallet continues to move forward. At the same time, the next stop lever rotates to the stop position to block the subsequent pallet. The distance the foremost pallet moves within the time of two indexing intervals forms the adjusted center distance between adjacent pallets.

2. The conveying device for the automotive charging pile tooling production line according to claim 1, characterized in that, It also includes a power coupling assembly, which comprises a spline joint and a spline sleeve; the spline joint is detachably connected to the station drive shaft, and the spline sleeve is fixedly connected to the differential planetary carrier; when the pallet enters the station, the spline joint engages with the spline sleeve, and the rotational motion of the station drive shaft is transmitted to the differential planetary carrier; when the pallet leaves the station, the spline joint separates from the spline sleeve.

3. The conveying device for the automotive charging pile tooling production line according to claim 1, characterized in that, The two vertical lead screws are trapezoidal lead screws or ball screws; the lower end of the vertical lead screw is movably connected to the pallet base frame through a thrust bearing, and the thrust bearing bears the axial load when the lead screw rotates and reduces the frictional resistance between the lead screw and the pallet base frame during the leveling process.

4. The conveying device for the automotive charging pile tooling production line according to claim 1, characterized in that, The ends of the two retractable support legs are provided with hemispherical support heads. The hemispherical support heads are detachably connected to the end of the vertical lead screw via ball sockets. The spherical surface of the hemispherical support head contacts the reference plane and can rotate within a limited angle in the ball socket to adapt to the local posture changes of the reference plane.

5. The conveying device for the automotive charging pile tooling production line according to claim 1, characterized in that, The end of the slot is provided with a guide transition curve, which realizes the acceleration and deceleration of the indexing motion of the side-mounted slotted wheel during the engagement and disengagement of the dial pin. The guide transition curve is a slow-in and slow-out curve.

6. The conveying device for the automotive charging pile tooling production line according to claim 1, characterized in that, The stop and pitch control assembly also includes a Geneva wheel locking mechanism, which is movably connected to the Geneva wheel disc body and locks the position of the side Geneva wheel during the indexing gap to prevent the side Geneva wheel from rotating unexpectedly due to the pallet thrust.

7. The conveying device for the automotive charging pile tooling production line according to claim 1, characterized in that, The outer ring of the differential is provided with a torque limiting clutch ring, which is interference-fitted with the outer ring of the differential. When the transmitted torque exceeds a set value, the torque limiting clutch ring slides relative to the outer ring of the differential, limiting the torque transmitted to the vertical lead screw to below the set peak value.

8. The conveying device for the automotive charging pile tooling production line according to claim 1, characterized in that, A locking ring is provided on the outside of the differential planetary carrier, and the locking ring is movably connected to the outer ring of the differential. When the pallet leaves the workstation, the locking ring moves to the locking position and engages with the locking groove on the differential planetary carrier to restrict the rotation of the differential planetary carrier, so that the relative position of the two vertical lead screws remains stable during conveying and indexing.

9. The conveying device for the automotive charging pile tooling production line according to claim 2, characterized in that, The spline joint and the station drive shaft are detachably slidable. The inner spline of the spline joint mates with the outer spline of the station drive shaft. The spline connection allows relative sliding in the axial direction and transmits torque in the circumferential direction.

10. The conveying device for the automotive charging pile tooling production line according to claim 1, characterized in that, The number of stops on the circumference of the grooved wheel is equal to the number of slots, and the angular distribution of the stops is consistent with the angular distribution of the slots. When the side-mounted grooved wheel rotates at the indexing interval, the stop at the original stop position moves aside, and the stop at the next stop position reaches the stop position. The displacement of the first pallet that is released during the duration of the adjacent indexing interval forms the adjusted pallet center distance.

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