Crank loading mechanism and crank assembly assembly system

Abstract

The application discloses a crank feeding mechanism, which comprises a crank vibrating feeding disc and a crank taking position. The crank taking position is provided with a V-shaped groove for taking the crank, which is V-shaped in the top view. The groove bottom of the V-shaped groove is provided with a groove for inserting the connecting shaft of the crank. The opening of the V-shaped groove is connected with the outlet of the crank tail section feeding channel of the crank vibrating feeding disc, and the V-shaped groove can accommodate a single crank. The crank tail section feeding channel is a cross-shaped groove structure. The connecting shaft of the crank and the upwardly extending lever of the crank are transmitted through the vertical two groove openings of the cross-shaped groove. The upper surface of the cross-shaped groove structure at the tail end of the crank tail section feeding channel is fixed with a pair of stop levers. The pair of stop levers extend to the inlet of the V-shaped groove for taking the crank, and gradually approach each other along the extending direction, and the distance between the most adjacent stop levers is close to the diameter of the lever.

Description

Technical Field

[0001] This invention belongs to the field of diaphragm gas meters, specifically relating to a crank feeding mechanism and a crank assembly system. Background Technology

[0002] A diaphragm gas meter mainly consists of a metering section (including two metering boxes, each containing a flexible diaphragm), a transmission section (including a diaphragm plate, a folding plate, a vertical shaft, a rocker arm, a connecting rod, a crank, a shift fork, and a valve cover), a counting section, and a housing. The remaining parts, excluding the housing, are collectively referred to as the movement of the diaphragm gas meter. Patent document CN201463953U illustrates the structure of the movement of a diaphragm gas meter.

[0003] The working principle of a diaphragm gas meter is as follows: A diaphragm (usually made of synthetic rubber) is sealed at the center line of each metering box, dividing the inside of the metering box into two metering chambers. After the gas enters the gas meter, it alternately enters the two metering chambers of each metering box, causing the diaphragm (and the diaphragm plate clamped on the diaphragm) to reciprocate. This creates a linkage: the diaphragm plate drives the outer end of the baffle plate, the inner sleeve part of the baffle plate drives the vertical shaft, the vertical shaft drives the rocker arm, the rocker arm drives the connecting rod, the connecting rod drives the crank, and the cam on the crank drives the shift fork, causing the valve cover to reciprocate on the valve grille and alternately open the air inlets of the two metering chambers of each metering box (the reciprocating motion of the valve grille allows the gas to alternately enter the two metering chambers of each metering box). In this way, one cycle can discharge the gas volume of two metering boxes (four metering chambers). At the same time, the crank rotates and drives the gear of the counter to rotate, and the counter displays the volume of gas discharged.

[0004] Currently, designing and introducing automated assembly lines for diaphragm gas meters is an inevitable trend in the industry, as it can significantly improve production efficiency and reduce production costs. For example, the technical solution disclosed in announcement number CN112975392A is "a fully automated assembly system for diaphragm gas meters".

[0005] However, because diaphragm gas meters have many components and a relatively complex structure, especially in the assembly of some key components, fully automated assembly systems are still prone to poor assembly quality, and even damage to component structures during assembly. For example, in the assembly between the outlet wheel in the crank assembly and the camshaft in the pointer assembly (including the "error adjustment mechanism" (see: "error accuracy adjustment mechanism of reciprocating valve gas meter" shown in announcement number CN201273832Y), "valve cover" and "guide rod bracket"), existing robotic arms and tooling often damage the drive teeth on the outlet wheel or camshaft during the pressing process, seriously affecting the product's metering accuracy, automated assembly efficiency, and making it difficult to ensure the smooth progress of automated assembly.

[0006] Therefore, how to design a mechanism that ensures the crank has the correct feeding posture, thereby ensuring the smooth progress of automated assembly, is a technical problem that needs to be considered and solved. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is: how to provide a crank feeding mechanism and crank assembly system that can ensure that the crank has the correct feeding posture, thereby ensuring the smooth progress of automated assembly.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A crank feeding mechanism includes a crank vibrating feeding plate and a crank picking position; the crank picking position has a V-shaped groove for picking up cranks in a top view, the bottom of which has a groove for inserting the connecting shaft of the crank; the opening of the crank picking V-shaped groove is connected to the outlet of the crank end feeding channel of the crank vibrating feeding plate, and the crank picking V-shaped groove can just accommodate a single crank;

[0010] Its features are:

[0011] The feed channel at the end of the crank is a cross-shaped groove structure. The connecting shaft of the crank faces downward and the lever of the crank faces upward, passing through the two vertical slots of the cross-shaped groove for conveying.

[0012] A pair of stop bars are fixed on the upper surface of the cross-shaped groove structure at the end of the crank end feeding channel. The pair of stop bars extend to the entrance of the V-shaped groove for picking up the crank, and the pair of stop bars gradually approach each other along the extension direction, with the distance between the closest points being close to the diameter of the lever.

[0013] Similarly, to effectively ensure the correct assembly posture between the outlet wheel in the crank assembly and the camshaft in the pointer assembly, the technical approach adopted in this solution is as follows:

[0014] The coaxially fixed outlet wheel is locked by locking the crank in the crank assembly. Therefore, the press fit between the outlet wheel and the crank is also the key to ensuring that the outlet wheel in the crank assembly and the camshaft in the pointer assembly can be accurately assembled.

[0015] In this technical solution, the crank feeding mechanism has a pair of stop levers fixed on the upper surface of the cross-shaped groove structure at the end of the crank feeding channel. The position of the lever on the crank can be adjusted by the pair of stop levers, so that the crank entering the crank pick-up position can have the predetermined correct assembly posture, thus laying a good foundation for subsequent precise assembly.

[0016] The crank assembly system includes a four-station turntable and crank assembly fixtures fixedly installed at each station on the four-station turntable.

[0017] It also includes an outlet wheel feeding mechanism, a support feeding mechanism, a crank feeding mechanism, and a material handling mechanism that are fixedly installed sequentially on the outside of the four-station turntable in the direction of rotation of the four-station turntable.

[0018] The characteristic feature is that the crank feeding mechanism is the crank feeding mechanism as described in claim 1 or 2.

[0019] In this way, the crank assembly tooling on the four-station turntable can be fully utilized, as well as the space outside the four-station turntable can be fully utilized to arrange the feed wheel mechanism, support feeding mechanism, crank feeding mechanism and pick-up mechanism, making the structural design of the crank assembly system more reasonable and the space utilization more efficient. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the crank assembly and pointer assembly of a diaphragm gas meter in the pre-assembly state.

[0021] Figure 2 This is a schematic diagram of the structure of a diaphragm gas meter after the crank assembly and pointer assembly are assembled.

[0022] Figure 3 This is a partial structural diagram of the crank assembly and camshaft assembly device in this technical solution (the movement with the crank assembly clamped, but the pointer assembly not yet assembled).

[0023] Figure 4 This is a partial structural diagram of the crank assembly and camshaft assembly device in this technical solution (i.e., the assembly of the pointer assembly).

[0024] Figure 5 This is a schematic diagram of the fixture for placing the pointer assembly in this technical solution.

[0025] Figure 6 This is a schematic diagram of the export vessel in this technical solution.

[0026] Figure 7 This is a schematic diagram of the export vessel in this technical solution.

[0027] Figure 8 This is a partial structural diagram of the loading mechanism for the export vessel in this technical solution.

[0028] Figure 9 for Figure 8 Enlarged view of section I in the middle.

[0029] Figure 10 This is a partial structural diagram of the crank-feeding mechanism in this technical solution.

[0030] Figure 11 for Figure 10 Enlarged view of section II in the middle.

[0031] Figure 12 This is an exploded view of the crank assembly tooling in this technical solution.

[0032] Figure 13 This is a schematic diagram of the crank assembly tooling in this technical solution.

[0033] Figure 14 This is a schematic diagram of the crank assembly assembly tooling used in this technical solution for assembling the crank assembly.

[0034] Figure 15 This is a schematic diagram of the crank assembly assembly fixture with the assembled crank assembly in this technical solution.

[0035] Marked in the image:

[0036] 900 crank assembly:

[0037] 901 Export Wheel: 9011 Assembly Shaft, 9012 Drive Disc, 9013 Drive Protrusion.

[0038] 9014 Attitude adjustment plane, 9015 Attitude adjustment protrusion

[0039] 902 support

[0040] 903 crank: 9031 lever, 9032 connecting shaft

[0041] 910 Pointer Assembly: 911 Camshaft, 912 Pointer, 913 Rocker Arm, 914 Guide Rod Holder, 915 Valve Cover, 920 Center Shaft

[0042] Crank assembly and camshaft assembly:

[0043] 931 Transfer Assembly Gripper Cylinder: 9311 Grip Block (93111 Upper Grip, 93112 Lower Grip)

[0044] Export wheel attitude control mechanism: 9321 attitude control cylinder, 9322 intermediate push-pull rod.

[0045] 9323 Attitude maintenance lever, 9324 Fixing block (93241 Strip slot)

[0046] Fixture for placing the 933 pointer assembly: 9331 base plate, 9332 positioning plate, 9333 positioning pin.

[0047] 9334 Positioning groove, 9335 Positioning protrusion, 9336 Insertion into positioning groove, 9337 T-shaped component, 9338 Internal and external threaded connecting bolt

[0048] Export vessel loading mechanism: 940 Export vessel part pick-up position, 941 Straight metal wire

[0049] Crank loading mechanism: 950 crank pick-up position, 951 stop lever

[0050] 960 Crank assembly fixture: 961 Fixture base (9611 positioning assembly socket), 962 Cylindrical seat (9621 insertion protrusion), 963 Bottom positioning support (9631 press-fit support surface, 9632 positioning post, 9633 annular groove, 9634 assembly insertion cylinder), 964 Anti-rotation rod, 965 Locking screw Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings.

[0052] A. Crank assembly and camshaft assembly method

[0053] In the crank assembly and camshaft assembly method, during the process of coaxially pressing the camshaft to the central shaft, in the vertical projection direction of the area where the camshaft and the outlet wheel in the crank assembly can mesh: the gear teeth on the camshaft all fall within the gap between two adjacent drive teeth on the outlet wheel in the crank assembly.

[0054] By adopting the above-mentioned technical solution for assembling the crank assembly and camshaft, it can be effectively ensured that during the coaxial pressing of the camshaft onto the central shaft, the gear teeth on the camshaft will not collide with the drive teeth on the outlet wheel in the crank assembly, thereby avoiding collision damage and effectively ensuring the efficiency and quality of the camshaft assembly.

[0055] However, how to effectively maintain the correct assembly posture of the camshaft and crank assembly outlet wheel during the coaxial pressing of the camshaft to the bottom shaft is a technical problem that has not been disclosed in the industry, and there is currently no effective solution.

[0056] Based on this, the present technical solution also includes at least one assembly device capable of implementing the above assembly method:

[0057] B. Crank assembly and camshaft assembly, such as Figures 3 to 5 As shown

[0058] A crank assembly and camshaft assembly device includes a transfer assembly gripper cylinder and a pointer assembly placement fixture, wherein the transfer assembly gripper cylinder has a pair of clamping blocks for clamping the movement.

[0059] It also includes an export wheel attitude holding mechanism for locking the attitude during the export wheel assembly process;

[0060] The pointer assembly placement fixture is used to load pointer assemblies with the correct assembly posture. The pointer assembly placement fixture is provided with a positioning structure for positioning each part of the pointer assembly. The positioning structure can maintain the correct assembly posture of the loaded pointer assembly.

[0061] Unlike existing technologies, by adopting the above-mentioned crank assembly and camshaft assembly device, the exit wheel attitude holding mechanism and pointer assembly tooling can be used to effectively ensure that the camshaft has the correct assembly posture to prevent collision during the coaxial pressing process to the central shaft, thereby effectively ensuring the smooth progress of automated assembly.

[0062] The export wheel attitude holding mechanism includes an attitude holding cylinder, a central push-pull rod, and an attitude holding lever.

[0063] One of the pair of clamping blocks of the transfer assembly gripper cylinder, near the crank, is a posture holding mounting block. The posture holding cylinder is fixedly mounted on the outer side of the posture holding mounting block. The push rod of the posture holding cylinder extends and retracts in the vertical direction and is hinged to one end of the intermediate push-pull rod. The other end of the intermediate push-pull rod is hinged to one end of the posture holding lever. The middle part of the posture holding lever in the length direction is rotatable via a pivot on the vertical end side mounted on the posture holding mounting block. The other end of the posture holding lever constitutes a locking end for pressing against and locking the crank lever.

[0064] The aforementioned exit wheel attitude retention mechanism has a simple and reasonable structure, is easy to operate and use, and has a guaranteed effect. When in use, simply activate the attitude retention cylinder while clamping the movement. The cylinder's push rod then drives the intermediate push-pull rod, which in turn drives the attitude retention lever. This causes the locking end of the attitude retention lever to press against the crank's lever and remain locked. After the crank's lever is locked, the exit wheel, which is tightly interference-fitted and fixed to the crank, is also locked, thus achieving the maintenance of the exit wheel's "correct assembly attitude".

[0065] The locking end of the retaining lever has a V-shaped cross-section limiting groove on the surface that contacts the crank lever. The length direction of the limiting groove is consistent with the length direction of the retaining lever, and the end of the limiting groove adjacent to the crank in the length direction is an open end.

[0066] The cross-section of the aforementioned limiting groove is V-shaped, which allows two inclined surfaces to form a guide surface. During the pressing process, the offset lever (which can drive the outlet wheel to rotate synchronously) can be guided to the correct position at the bottom of the groove to achieve locking and positioning, ensuring that the outlet wheel maintains an accurate assembly posture.

[0067] The bottom of the opening end of the limiting groove is provided with a positioning groove. The width of the positioning groove is consistent with the radial thickness of the lever on the crank and allows the lever to be precisely engaged and locked.

[0068] The aforementioned positioning groove enables the lever to achieve a high-precision positioning effect, facilitating precise automatic assembly between the camshaft in the outlet wheel and the pointer assembly.

[0069] The exit wheel attitude holding mechanism further includes an intermediate push-pull rod stop limit structure. The intermediate push-pull rod stop limit structure includes a fixing block. The fixing block is fixedly installed with the outer side of the attitude holding mounting block. The fixing block is provided with a strip-shaped slot extending in the vertical direction. Each of the upper and lower end faces of the fixing block is screwed with an adjusting screw. The end of the adjusting screw facing away from the bolt head is located in the strip-shaped slot to form a limit stop.

[0070] The connecting pin between the intermediate push-pull rod and the push rod extends along its own axis and is inserted into the strip-shaped slot, and can contact the limiting stop point to achieve stop.

[0071] The above-mentioned intermediate push-pull rod stop limit structure is simple in structure and easy to process and install on the clamping block.

[0072] At the same time, the position of the limit stop can be precisely adjusted by adjusting the aforementioned adjusting screws, thereby accurately controlling the stop position of the intermediate push-pull rod, ensuring the precise action of the attitude maintenance lever, avoiding damage to the lever by the attitude maintenance lever, and also avoiding excessive reset of the attitude maintenance lever, which would increase the time required for locking and unlocking, thus accelerating the locking and unlocking process.

[0073] Each clamping block has an upper clamping part and a lower clamping part;

[0074] The upper clamping part has two clamping parts, each with an inverted L-shaped structure. The lower end face of the lateral extension of the inverted L-shaped structure of each clamping part is used to abut against the upper edge of the metering shell. The outer end of the lateral extension of the inverted L-shaped structure of the clamping part has a V-shaped groove in the top view. The grooves of the two clamping parts are used to abut against the outer side of the vertical shaft sleeve and the air outlet to achieve lateral clamping and limiting.

[0075] The lower clamping part has an L-shaped clamping block, and the inner surface of the vertical part of the clamping block and the upper surface of the horizontal part are used to fit and contact the lower middle surface of the outer convex surface of the metering shell.

[0076] The "up and down direction" mentioned in this technical solution is consistent with the up and down direction of the movement's posture.

[0077] This technical solution, by employing the aforementioned clamping block with upper and lower clamping parts, achieves better vertical and horizontal clamping and positioning effects, ensuring accurate transfer and smooth subsequent assembly operations.

[0078] like Figure 5 As shown, a pointer assembly placement fixture is provided for fixing the pointer assembly upside down and so that the lower section of the camshaft faces upward; the pointer assembly placement fixture includes a base plate and a positioning plate;

[0079] The base plate is used to be laid on the transmission belt for conveying assembly. The positioning plate is fixedly installed on the upper surface of the base plate. The upper surface of the positioning plate is provided with a rocker arm positioning structure, a pointer positioning structure and a guide rod frame positioning structure in sequence from front to back along the conveying direction of the transmission belt.

[0080] The rocker arm positioning structure includes two positioning posts spaced apart in the vertical transmission belt direction. Each of the two positioning posts has a positioning pin on its upper surface for inserting into the corresponding positioning hole on the rocker arm in the pointer assembly.

[0081] The pointer positioning structure includes a positioning groove into which the pointer and the dial can be embedded;

[0082] The guide rod frame positioning structure includes two positioning protrusions spaced apart in the direction of vertical transmission belt conveying. The inner surfaces of the two positioning protrusions are provided with insertion positioning grooves for the bent portions and end sections of the guide rod frame to be inserted and achieve lateral and longitudinal positioning.

[0083] The advantage of using the above-mentioned pointer assembly placement fixture is that the rocker arm can be positioned in the correct assembly posture before pressing by the rocker arm positioning structure in the positioning plate, thereby ensuring that the assembly shaft on the rocker arm can be aligned and inserted into the corresponding assembly hole on the movement.

[0084] By employing the pointer positioning structure in the positioning plate, the pointer can be ensured to point to the correct predetermined position and maintain it through the positioning groove. Once the pointer is in the correct position, the position of the camshaft and its gear teeth can be determined and maintained, thus creating conditions for the precise and smooth assembly between the camshaft and the outlet wheel.

[0085] By using the guide rod bracket positioning structure in the positioning plate, the guide rod bracket that guides the valve cover to slide can have the correct assembly posture.

[0086] In practice, the insertion positioning groove on each positioning protrusion is preferably formed on the vertical surface where the horizontal and vertical sections of a T-shaped component intersect; the positioning protrusion is provided with a vertical assembly groove for the vertical section of the T-shaped component to be inserted, and the horizontal section of the T-shaped component overlaps the upper surface of the assembly groove.

[0087] There is a through connection hole between the positioning protrusion and the T-shaped component. A pin is inserted into the connection hole to fix the T-shaped component on the positioning protrusion. The two ends of the pin are exposed and locked by locking components.

[0088] The advantages of using the assembly structure between the T-shaped component and the positioning protrusion described above are:

[0089] 1. Because the guide rod frame is thin (diameter less than 2mm), the machining accuracy requirements for the insertion positioning slot are high. The above-mentioned T-shaped component can be independently designed from the positioning protrusion, which can greatly reduce the machining difficulty of the insertion positioning slot on the positioning plate, and also avoid the situation where the entire positioning plate is scrapped when the machining of the insertion positioning slot on the positioning plate does not meet the requirements.

[0090] 2. T-shaped components are not only easy to process, but also easy to assemble securely, resulting in better design and usage effects.

[0091] The positioning plate is a rectangular plate structure, and each of the four corners of the positioning plate is provided with a mounting hole. Each mounting hole is connected to the upper part of the internal thread hole of the internal and external threaded connecting bolt fixed to the base plate by a connecting screw.

[0092] In this way, the precise setting height of the positioning plate can be adjusted by the height of the internal and external threaded connecting bolts, thereby better ensuring the requirements of high-precision automated assembly.

[0093] C. Export vessel and its loading mechanism, such as Figures 6 to 9 As shown

[0094] An export wheel includes an assembly shaft cylinder, one end of which is fixedly connected to a drive disc, and the drive disc is provided with drive teeth;

[0095] The drive teeth include a plurality of bullet-shaped drive protrusions provided on the end face of the drive disk away from the assembly shaft cylinder, and the plurality of drive protrusions are evenly spaced around the edge of the drive disk.

[0096] The outer side of the assembly shaft is provided with a columnar shoulder for adjusting the loading posture. The shoulder for adjusting the loading posture has a pair of back-to-back and parallel posture adjustment planes and a pair of back-to-back and equal-diameter arc surfaces in the circumferential direction. The distance between the pair of posture adjustment planes is smaller than the diameter of the arc surfaces.

[0097] The advantages of the export wheel structure used in this technical solution are:

[0098] 1. The distance between the two attitude adjustment planes on the exit wheel is shorter than the diameter of the arc surface of the shoulder for adjusting the feeding posture. The pair of attitude adjustment planes form a narrowing structure, which makes it easier to set an entrance with the same width as the distance between the two attitude adjustment planes at the entrance of the feeding channel at the end of the exit wheel on the vibrating feeding plate of the exit wheel. In this way, the posture of the exit wheel entering the feeding channel at the end of the exit wheel can be adjusted and corrected, and the posture of the exit wheel to be used for feeding and assembly can be better controlled.

[0099] 2. The drive protrusion with the above structure and layout can form a gap between two adjacent drive protrusions that is not easily damaged by pressure and can be reliably assembled and used, thereby facilitating the correct and reliable automated precision assembly between the outlet wheel and the camshaft.

[0100] The drive disk has two attitude adjustment protrusions on its end face where the drive protrusion is located. The two attitude adjustment protrusions are spaced apart on a single diameter of the drive disk. The single diameter is parallel to the attitude adjustment plane, and the drive protrusion and the attitude adjustment protrusion are mirror-symmetrical about the single diameter. The beginning and end of the single diameter pass through the gap between two adjacent drive protrusions.

[0101] Because the export wheel is fed by the vibratory feeder and then enters a fixed export wheel pick-up position through the end of the export wheel feeding channel, which can only accommodate a single export wheel, the posture of the export wheel is very easy to change during the process of entering the export wheel pick-up position due to the lack of a limiting structure. This makes it impossible to effectively ensure that the export wheel to be picked up and assembled has the correct posture.

[0102] In this technical solution, by adopting the structure of the two posture adjustment protrusions and the drive teeth, a rigid metal wire parallel to the single diameter can be set at the part pick-up position of the outlet wheel. After passing through the gap between two adjacent drive teeth, it contacts one side of the two posture adjustment protrusions. A "straight line" is determined by the two contact points, thereby effectively ensuring that the outlet wheel has the same correct posture when it moves from the end of the vibratory plate to the part pick-up position of the outlet wheel, thus effectively ensuring that the subsequent automatic assembly is correct and accurate.

[0103] At the same time, the structure that ensures the correct posture of the straight metal wire in conjunction with the exit wheel will not adversely affect the smooth material picking up of the exit wheel, ensuring that the exit wheel can be picked up smoothly and reliably.

[0104] The posture adjustment protrusion has a smaller outward protrusion height than the driving protrusion; the portion of the posture adjustment protrusion closer to the driving disk in the outward protrusion direction has a cubic structure, while the portion farther from the driving disk has a pyramidal structure.

[0105] In this way, the upper pyramid structure of the attitude adjustment protrusion makes it easier for the extended outer end of the rigid metal wire to enter the surrounding open area of ​​the pyramid structure, and finally get into the gap between the cubic structure of the attitude adjustment protrusion and the adjacent drive protrusion, thus achieving contact with the two adjustment protrusions and ensuring that the exit wheel at the exit wheel pick-up position has the correct attitude.

[0106] The export wheel loading mechanism includes an export wheel vibrating loading plate and an export wheel part removal position;

[0107] The outlet wheel pick-up position has a V-shaped groove for picking up the outlet wheel in a V-shape when viewed from above. The opening of the V-shaped groove for picking up the outlet wheel is connected to the outlet of the feeding channel at the end of the outlet wheel of the outlet wheel vibrating feeding plate, and the V-shaped groove for picking up the outlet wheel can just accommodate a single outlet wheel.

[0108] Its features are:

[0109] The feeding channel at the end of the outlet wheel of the vibrating feeder is an inverted T-shaped groove structure, and the width of the vertical part of the inverted T-shaped groove is close to the distance between the two attitude adjustment planes on a single outlet wheel.

[0110] This ensures that the material entering the feeding channel at the end of the exit wheel can only be in one posture: the posture in which the two posture adjustment planes on a single exit wheel can just enter the slot of the vertical part of the T-slot. This posture is also a definite posture for conveying and picking up materials, which can effectively ensure the certainty of the posture during subsequent assembly and facilitate correct and smooth automatic assembly.

[0111] A rigid metal wire is fixedly installed on the transverse side wall of the V-groove for the take-off wheel near the tip. The rigid metal wire extends straight out of the groove opening of the V-groove for the take-off wheel. The rigid metal wire is used to insert into the gap between the attitude adjustment protrusion and the adjacent drive protrusion, and can contact the two attitude adjustment protrusions of a single take-off wheel.

[0112] The aforementioned rigid metal wire and the two adjustment protrusions on the exit wheel can cooperate to ensure that the exit wheel has the correct assembly posture during the process of moving from the feeding channel at the end of the exit wheel to the part picking position of the exit wheel.

[0113] As described above, the two adjustment protrusions on the aforementioned rigid metal wire and the outlet wheel achieve low cost and good reliable performance through an extremely simple and effective structure.

[0114] D. Crank-feeding mechanism, such as Figure 10 and Figure 11 As shown

[0115] A crank feeding mechanism includes a crank vibrating feeding plate and a crank picking position; the crank picking position has a V-shaped groove for picking up cranks in a top view, the bottom of which has a groove for inserting the connecting shaft of the crank; the opening of the crank picking V-shaped groove is connected to the outlet of the crank end feeding channel of the crank vibrating feeding plate, and the crank picking V-shaped groove can just accommodate a single crank;

[0116] The feed channel at the end of the crank is a cross-shaped groove structure. The connecting shaft of the crank faces downward and the lever of the crank faces upward, passing through the two vertical slots of the cross-shaped groove for conveying.

[0117] A pair of stop bars are fixed on the upper surface of the cross-shaped groove structure at the end of the crank end feeding channel. The pair of stop bars extend to the entrance of the V-shaped groove for picking up the crank, and the pair of stop bars gradually approach each other along the extension direction, with the distance between the closest points being close to the diameter of the lever.

[0118] Similarly, to effectively ensure the correct assembly posture between the outlet wheel in the crank assembly and the camshaft in the pointer assembly, the technical approach adopted in this solution is as follows:

[0119] The coaxially fixed outlet wheel is locked by locking the crank in the crank assembly. Therefore, the press fit between the outlet wheel and the crank is also the key to ensuring that the outlet wheel in the crank assembly and the camshaft in the pointer assembly can be accurately assembled.

[0120] In this technical solution, the crank feeding mechanism has a pair of stop levers fixed on the upper surface of the cross-shaped groove structure at the end of the crank feeding channel. The position of the lever on the crank can be adjusted by the pair of stop levers, so that the crank entering the crank pick-up position can have the predetermined correct assembly posture, thus laying a good foundation for subsequent precise assembly.

[0121] An air jet pipe (not shown in the figure) is provided on the outside of the feed channel at the end of the crankshaft, with the air jet nozzle facing the entrance of the feed channel at the end of the crankshaft.

[0122] Because the crank is made of plastic and is relatively lightweight, the inlet of the feed channel at the end of the crank can only accommodate a single crank, making the inlet quite narrow and prone to jamming during vibration and material transfer. By installing the aforementioned air jet pipe, air can be used to quickly remove the newly entered crank, allowing subsequent cranks to smoothly enter the feed channel at the end of the crank, thus ensuring smoother material transfer.

[0123] During implementation, the air inlet of the jet pipe is connected to an air source (fan, air pump, or high-pressure air source).

[0124] E. Crank assembly fixtures, such asFigures 12 to 15 As shown

[0125] Crank assembly fixture, including fixture base;

[0126] It also includes a cylindrical base and a bottom positioning support;

[0127] The cylindrical seat is fixedly installed on the upper surface of the tooling base. The cylindrical opening of the cylindrical seat allows the drive disc of the outlet wheel to be inserted coaxially. The circumferential sidewall of the cylindrical seat is provided with a positioning slot for the locking block on the support in the crank assembly to be engaged and positioned. The circumferential sidewall of the cylindrical seat is also provided with a photoelectric detection hole for detecting whether the outlet wheel is in place.

[0128] The bottom positioning support is coaxially fixed to the inner bottom of the cylindrical seat. The bottom positioning support is a cylindrical structure. The upper surface of the cylindrical structure forms a press-fit support surface. A protruding positioning post is provided in the middle of the press-fit support surface. The positioning post is used to insert into the positioning hole in the center of the drive disc of the outlet wheel, and the upper end of the positioning post can be used to abut and limit the connection shaft of the press-fit crank.

[0129] The press-fit support surface is provided with an annular groove into which the attitude adjustment protrusion on the export wheel falls;

[0130] The outer circumference of the cylindrical structure and the inner side of the cylindrical seat have an annular cavity for the drive teeth on the drive disc of the outlet wheel to be inserted.

[0131] The aforementioned crank assembly tooling has a simple structure, is easy to process and arrange, and can detect whether the outlet wheel in the crank assembly is placed in place, as well as ensure accurate positioning during the support press-fitting process.

[0132] The positioning pins on the bottom positioning support not only accurately position the outlet wheel, but also serve as the clamping stop for the connecting shaft of the crank, thus ensuring the correct assembly of the crank assembly itself.

[0133] The lower surface of the cylindrical base is provided with a non-cylindrical insertion protrusion, and a cylindrical hole is provided through the insertion protrusion; the upper surface of the tooling base has a positioning assembly hole for the insertion protrusion to be inserted, and the lower surface of the tooling base is provided with a countersunk hole communicating with the positioning assembly hole.

[0134] The lower surface of the bottom positioning support is provided with a convex assembly plug-in cylinder for insertion into the cylindrical hole, and the lower end face of the assembly plug-in cylinder is provided with a threaded hole.

[0135] The bottom positioning support is inserted into the cylindrical hole of the cylindrical seat through an assembly plug-in cylinder, and the cylindrical seat is inserted into the positioning assembly socket of the tooling base through an insertion protrusion. The cylindrical seat and the bottom positioning support are assembled and fixed on the tooling base by the threaded connection between the locking screw in the countersunk hole and the threaded hole.

[0136] The above-mentioned cylindrical seat and bottom positioning support are cleverly designed for assembly and fixation on the tooling base, giving them more functions: they can not only be used for press-fitting crank assemblies, but also serve as fixed connecting parts. This allows the cylindrical seat and bottom positioning support to achieve accurate assembly and fixation on the tooling base through their mating structure with the tooling base, resulting in better performance and simplifying the structural design and the use of connecting components.

[0137] The outer side of the upper section of the cylindrical structure of the bottom positioning support is provided with a through hole in the circumferential direction along a single diameter. Correspondingly, the circumferential sidewall of the cylindrical seat is provided with a through hole that can be aligned and communicate with the through hole.

[0138] An anti-rotation rod is provided through the perforation and through hole. The diameter of the anti-rotation rod, the diameter of the perforation and the diameter of the through hole are close, and the anti-rotation rod can be inserted into the gap between two adjacent drive protrusions on the outlet wheel. The two ends of the anti-rotation rod are located outside the cylindrical seat and are fixedly connected to limit nuts by threads.

[0139] With the above structure, the bottom positioning support can be effectively prevented from rotating in the circumferential direction by the anti-rotation rod, so that the outlet wheel can maintain a fixed and correct posture during the crank assembly press-fitting process.

[0140] Furthermore, the aforementioned anti-rotation rod can be precisely inserted into the gap between two adjacent drive protrusions on the outlet wheel. That is, the diameter of the anti-rotation rod is consistent with the width of the gap between two adjacent drive protrusions on the outlet wheel. In this way, whether the outlet wheel is in the correct posture can be further determined by whether there is a collision between the anti-rotation rod and the drive protrusion (the method of determination is: since the outlet wheel is transferred and placed onto the tooling by a preset robot, the parameters such as the movement stroke of the robot and the change in placement resistance are used to determine whether the outlet wheel is in the correct pressing posture). This lays a good foundation for the correct assembly between the outlet wheel and the camshaft.

[0141] F. Crank assembly system

[0142] The crank assembly system includes a four-station turntable (not shown in the figure) and a crank assembly fixture fixedly installed at each station on the four-station turntable.

[0143] It also includes an outlet wheel feeding mechanism, a support feeding mechanism, a crank feeding mechanism, and a material handling mechanism, which are fixedly installed sequentially on the outside of the four-station turntable in the direction of rotation of the four-station turntable.

[0144] In this way, the crank assembly tooling on the four-station turntable can be fully utilized, as well as the space outside the four-station turntable can be fully utilized to arrange the feed wheel mechanism, support feeding mechanism, crank feeding mechanism and pick-up mechanism, making the structural design of the crank assembly system more reasonable and the space utilization more efficient.

[0145] The above are merely preferred embodiments of the present invention. It should be noted that any modifications and improvements made by those skilled in the art without departing from the present technical solution should also be considered to fall within the scope of protection claimed in this claim.

Claims

1. A crank assembly system, including a four-station turntable and a crank assembly fixture fixedly installed at each station on the four-station turntable; It also includes an outlet wheel feeding mechanism, a support feeding mechanism, a crank feeding mechanism, and a material handling mechanism that are fixedly installed sequentially on the outside of the four-station turntable in the direction of rotation of the four-station turntable. Its features are: in, The export wheel includes an assembly shaft cylinder, one end of which is fixedly connected to a drive disc. The drive disc is provided with drive teeth. The drive teeth include a plurality of bullet-shaped drive protrusions on the end face of the drive disc facing away from the assembly shaft cylinder. The plurality of drive protrusions are evenly spaced around the edge of the drive disc. A columnar shoulder for adjusting the loading posture is provided on the outer side of the assembly shaft cylinder. The shoulder for adjusting the loading posture has a pair of back-to-back and parallel posture adjustment planes and a pair of back-to-back and equal-diameter arc surfaces in the circumferential direction. The distance between the pair of posture adjustment planes is smaller than the diameter of the arc surfaces. The crank assembly fixture includes a fixture base, a cylindrical seat, and a bottom positioning support; The cylindrical seat is fixedly installed on the upper surface of the tooling base. The cylindrical opening of the cylindrical seat allows the drive disc of the outlet wheel to be inserted coaxially. The circumferential sidewall of the cylindrical seat is provided with a positioning slot for the locking block on the support in the crank assembly to be engaged and positioned. The bottom positioning support is coaxially fixed to the inner bottom of the cylindrical seat. The bottom positioning support is a cylindrical structure. The upper surface of the cylindrical structure forms a press-fit support surface. A protruding positioning post is provided in the middle of the press-fit support surface. The positioning post is used to insert into the positioning hole in the center of the drive disc of the outlet wheel, and the upper end of the positioning post can be used to abut and limit the connection shaft of the press-fit crank. The press-fit support surface is provided with an annular groove into which the attitude adjustment protrusion on the export wheel falls; The outer circumference of the cylindrical structure and the inner side of the cylindrical seat have an annular cavity for the drive teeth on the drive disc of the outlet wheel to be inserted. The outer circumferential surface of the upper section of the cylindrical structure of the bottom positioning support is provided with a through hole along a single diameter. Correspondingly, the circumferential sidewall of the cylindrical seat is provided with a through hole that can be aligned and penetrated with the through hole. An anti-rotation rod is provided through the through hole and the through hole, and the anti-rotation rod can be inserted precisely into the gap between two adjacent drive protrusions on the outlet wheel.

2. The crank assembly system according to claim 1, characterized in that: The crank feeding mechanism includes a crank vibrating feeding plate and a crank picking position; the crank picking position has a V-shaped groove for picking up cranks in a top view, and the bottom of the V-shaped groove for picking up cranks has a groove for inserting the connecting shaft of the crank; the opening of the V-shaped groove for picking up cranks is connected to the outlet of the crank end section feeding channel of the crank vibrating feeding plate, and the V-shaped groove for picking up cranks can just accommodate a single crank; The feed channel at the end of the crank is a cross-shaped groove structure. The connecting shaft of the crank faces downward and the lever of the crank faces upward, passing through the two vertical slots of the cross-shaped groove for conveying. A pair of stop bars are fixed on the upper surface of the cross-shaped groove structure at the end of the crank end feeding channel. The pair of stop bars extend to the entrance of the V-shaped groove for picking up the crank, and the pair of stop bars gradually approach each other along the extension direction, with the distance between the closest points being close to the diameter of the lever.

3. The crank assembly system according to claim 2, characterized in that: An air jet pipe is provided on the outside of the feed channel at the end of the crankshaft, with the air jet nozzle facing the entrance of the feed channel at the end of the crankshaft.

Images