Crank assembly and camshaft assembly device

Abstract

The present invention discloses a crank assembly and camshaft assembly device, including a transfer assembly clamping cylinder and a pointer assembly placement tooling, wherein the transfer assembly clamping cylinder has a pair of clamping blocks for clamping the movement; the characteristic is that it also includes an outlet wheel posture maintaining mechanism for locking the posture during the outlet wheel assembly process; the pointer assembly placement tooling is used to load a pointer assembly with a correct assembly posture, and the pointer assembly placement tooling is provided with a positioning structure for positioning various parts of the pointer assembly, and the positioning structure can maintain the correct assembly posture of the loaded pointer assembly. After adopting the above-mentioned technical solution of the crank assembly and camshaft assembly device, the outlet wheel posture maintaining mechanism and the pointer assembly placement tooling can be used to effectively ensure that the camshaft always has a correct assembly posture to prevent collision during the coaxial press-fitting of the camshaft to the center shaft, thereby effectively ensuring the smooth progress of the automated assembly.

Description

Technical Field

[0001] The invention belongs to the field of diaphragm gas meters, and in particular relates to a crank assembly and a camshaft assembly device. Background Art

[0002] The diaphragm gas meter is mainly composed of a metering part (including two metering boxes each with a flexible diaphragm inside), a transmission part (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 part and a housing, wherein the rest of the parts except the housing are collectively referred to as the movement of the diaphragm gas meter. The patent document with announcement number CN201463953U shows the structure of the movement of the diaphragm gas meter.

[0003] The working principle of the diaphragm gas meter is as follows: a diaphragm (usually made of synthetic rubber) is sealed and installed at the center line of each metering box, and the diaphragm divides the inside of the metering box into two metering gas chambers. After the gas enters the gas meter, it alternately enters the two metering gas chambers of each metering box, so that the diaphragm (and the diaphragm plate sandwiched on the diaphragm) reciprocates, and then realizes linkage - the diaphragm plate drives the folding plate (the outer end), the folding plate (the inner sleeve part) 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 to make the valve cover reciprocate on the valve grid and alternately open the air inlet of the two metering gas chambers of each metering box (the reciprocating motion of the valve grid can make the gas alternately enter the two metering gas chambers of each metering box). In this way, one cycle can discharge the volume of gas in two metering boxes (four metering gas chambers), and at the same time, the crank rotates and drives the gear of the counter to rotate, and the counter displays the volume of discharged gas.

[0004] At present, the design and introduction of automatic assembly production lines for diaphragm gas meters is the general trend of the industry, which can greatly improve production efficiency and reduce production costs. For example, the technical solution of announcement number CN112975392A discloses "a fully automatic assembly system for diaphragm gas meters".

[0005] However, because the membrane gas meter has many accessories and a relatively complex structure, especially the assembly between some key components, the fully automated assembly system is still prone to poor assembly quality, and even damage to the component structure 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 frame"), the existing manipulator and tooling often damage the driving teeth on the outlet wheel or camshaft during the press-fitting process, which seriously affects the product metering accuracy, the efficiency of automated assembly and makes it difficult to ensure the smooth progress of automated assembly.

[0006] Based on this, how to design a crank assembly and camshaft assembly device that can effectively ensure the progress of automated assembly is a close technical issue that needs to be considered. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a crank assembly and camshaft assembly device that can effectively ensure the progress of automated assembly.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] The crank assembly and camshaft assembly device comprises a transfer assembly clamping cylinder and a pointer assembly placement tool, wherein the transfer assembly clamping cylinder has a pair of clamping blocks for clamping the movement; the characteristics are:

[0010] Also included is an exit wheel posture holding mechanism for locking the posture of the exit wheel during assembly;

[0011] The pointer assembly placement tool is used to load the pointer assembly with a correct assembly posture. The pointer assembly placement tool is provided with a positioning structure for positioning various parts of the pointer assembly. The positioning structure can maintain the correct assembly posture of the loaded pointer assembly.

[0012] Compared with the prior art, the crank assembly and camshaft assembly method of the present invention has the following advantages:

[0013] Different from the prior art, after adopting the technical solution of the crank assembly and camshaft assembly device mentioned above, the outlet wheel posture maintaining mechanism and the pointer assembly placement tooling can be used to effectively ensure that the camshaft always has the correct assembly posture to prevent collision during the coaxial pressing process to the center shaft, thereby effectively ensuring the smooth progress of the automated assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a schematic diagram of the structure of the crank assembly and pointer assembly on the diaphragm gas meter in the state of being assembled.

[0015] Figure 2 This is a schematic diagram of the structure after the crank assembly and pointer assembly on the diaphragm gas meter are assembled.

[0016] Figure 3 It is a partial structural schematic diagram of the crank assembly and camshaft assembly device in the present technical solution (the movement state of the crank assembly is clamped and assembled, and the pointer assembly is not assembled).

[0017] Figure 4 It is a partial structural schematic diagram of the crank assembly and camshaft assembly device in the present technical solution (i.e., the pointer assembly).

[0018] Figure 5 This is a schematic diagram of the structure of the tooling for placing the pointer assembly in this technical solution.

[0019] Figure 6 This is a schematic diagram of the structure of the export wheel in this technical solution.

[0020] Figure 7 This is a schematic diagram of the structure of the export wheel in this technical solution.

[0021] Figure 8 This is a partial structural diagram of the outlet wheel feeding mechanism in this technical solution.

[0022] Fig. 9 for Figure 8 Enlarged view of point I in the middle.

[0023] Fig.10 It is a partial structural schematic diagram of the crank feeding mechanism in this technical solution.

[0024] Fig.11 for Fig.10 Enlarged view of point II in the middle.

[0025] Fig.12 This is an exploded view of the crank assembly assembly tooling in this technical solution.

[0026] Fig.13 This is a schematic diagram of the structure of the crank assembly assembly tooling in this technical solution.

[0027] Fig.14 This is a schematic diagram of assembling a crank assembly using a crank assembly assembly tool in the present technical solution.

[0028] Fig.15 This is a schematic diagram of the crank assembly assembly tooling with an assembled crank assembly in the present technical solution.

[0029] Markings in the figure:

[0030] 900 Crank Assembly:

[0031] 901 export wheel: 9011 assembly shaft cylinder, 9012 driving disc, 9013 driving protrusion, 9014 posture adjustment plane, 9015 posture adjustment protrusion

[0032] 902 support

[0033] 903 crank: 9031 lever, 9032 connecting shaft

[0034] 910 pointer assembly: 911 camshaft, 912 pointer, 913 rocker arm, 914 guide rod bracket, 915 valve cover 920 center shaft

[0035] Crank assembly and camshaft assembly:

[0036] 931 transfer assembly clamping cylinder: 9311 clamping block (93111 upper clamping part, 93112 lower clamping part)

[0037] Export wheel attitude holding mechanism: 9321 attitude holding cylinder, 9322 middle push-pull rod, 9323 attitude holding lever, 9324 fixing block (93241 strip slot hole)

[0038] 933 pointer assembly placement tooling: 9331 base plate, 9332 positioning plate, 9333 positioning pin, 9334 positioning groove, 9335 positioning protrusion, 9336 insert positioning groove, 9337 T-shaped component, 9338 internal and external thread connection bolt

[0039] Exit wheel feeding mechanism: 940 exit wheel pick-up position, 941 hard straight wire

[0040] Crank loading mechanism: 950 crank pick-up position, 951 gear lever

[0041] 960 crank assembly assembly tooling: 961 tooling base (9611 positioning assembly socket), 962 cylindrical seat (9621 plug-in boss), 963 bottom positioning support (9631 press-fit support surface, 9632 positioning column, 9633 annular groove, 9634 assembly plug-in cylinder), 964 anti-rotation rod, 965 locking screw DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0043] A. Assembly method of crank assembly and camshaft

[0044] A method for assembling a crank assembly and a camshaft, wherein during the process of coaxially pressing the camshaft onto the center 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 gaps between any two adjacent drive teeth on the outlet wheel in the crank assembly.

[0045] By adopting the technical solution of the crank assembly and camshaft assembly method mentioned above, it can be effectively ensured that during the process of coaxially pressing the camshaft onto the center shaft, the gear teeth on the camshaft will not collide with the driving teeth on the outlet wheel in the crank assembly, thereby avoiding collision and pressure damage, and effectively ensuring the smooth assembly efficiency and assembly quality of the camshaft.

[0046] However, how to effectively maintain the correct assembly posture of the outlet wheel of the camshaft and the crank assembly during the process of coaxially pressing the camshaft onto the center shaft is a technical problem that has not been disclosed in the industry and there is currently no effective solution.

[0047] Based on this, the technical solution also designs at least one assembly device capable of implementing the above-mentioned assembly method:

[0048] B. Crank assembly and camshaft assembly, such as Figures 3 to 5 Shown

[0049] The crank assembly and camshaft assembly device comprises a transfer assembly clamping cylinder and a pointer assembly placement tool, wherein the transfer assembly clamping cylinder has a pair of clamping blocks for clamping the movement;

[0050] Also included is an exit wheel posture holding mechanism for locking the posture of the exit wheel during assembly;

[0051] The pointer assembly placement tool is used to load the pointer assembly with a correct assembly posture. The pointer assembly placement tool is provided with a positioning structure for positioning various parts of the pointer assembly. The positioning structure can maintain the correct assembly posture of the loaded pointer assembly.

[0052] Different from the prior art, after adopting the technical solution of the crank assembly and camshaft assembly device mentioned above, the outlet wheel posture maintaining mechanism and the pointer assembly placement tooling can be used to effectively ensure that the camshaft always has the correct assembly posture to prevent collision during the coaxial pressing process to the center shaft, thereby effectively ensuring the smooth progress of the automated assembly.

[0053] Wherein, the exit wheel posture maintaining mechanism comprises a posture maintaining cylinder, an intermediate push-pull rod and a posture maintaining lever;

[0054] The clamping block of the pair of clamping blocks of the transfer assembly clamping claw cylinder, which is close to the crank, is a posture maintaining mounting block, and the posture maintaining cylinder is fixedly installed on the outer side of the posture maintaining mounting block. The push rod of the posture maintaining cylinder is telescopic in the vertical direction and is hingedly connected to one end of the intermediate push-pull rod, and the other end of the intermediate push-pull rod is used to be hingedly connected to one end of the posture maintaining lever. The middle part of the posture maintaining lever in the length direction can be rotatably installed on the vertical end side of the posture maintaining mounting block through a pivot, and the other end of the posture maintaining lever constitutes a locking end for pressing and keeping the crank's shift rod locked.

[0055] The above-mentioned outlet wheel posture maintaining mechanism has a simple and reasonable structure, is easy to operate and use, and has guaranteed effect. When in use: it is only necessary to start the dynamic posture maintaining cylinder while clamping the movement, and the push rod of the cylinder will then drive the intermediate push-pull rod, and the intermediate push-pull rod will drive the posture maintaining lever, so that the locking end of the posture maintaining lever presses against the crank lever to keep it locked. After the crank lever is locked, the outlet wheel fixedly connected to the crank with a tight interference fit also remains locked, thereby completing the maintenance of the "correct assembly posture" of the outlet wheel.

[0056] Among them, the locking end of the retaining lever is used to contact the crank's shift rod and has a limiting groove with a V-shaped cross-section. 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.

[0057] The cross-section of the above-mentioned limiting groove is V-shaped, so that two inclined surfaces can be used 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 can be smoothly maintained in an accurate assembly posture.

[0058] A positioning groove is provided at the bottom of the opening end of the limiting groove, and the groove width of the positioning groove is consistent with the radial thickness of the shifting rod on the crank and allows the shifting rod to be exactly inserted and accurately locked.

[0059] The arrangement of the positioning grooves can enable the lever to obtain a high-precision and accurate positioning effect, thereby facilitating accurate automatic assembly between the outlet wheel and the camshaft in the pointer assembly.

[0060] Wherein, the exit wheel posture maintaining mechanism also includes an intermediate push-pull rod stop point limiting structure, the intermediate push-pull rod stop point limiting structure includes a fixed block, the fixed block is fixedly mounted with the outer side surface of the posture maintaining mounting block, the fixed block is provided with a strip slot extending in the vertical direction, and the upper and lower end surfaces of the fixed block are each screwed with an adjusting screw through a thread, and the end of the adjusting screw away from the bolt head is located in the strip slot to form a limit stop point;

[0061] The connecting pin shaft between the intermediate push-pull rod and the push rod extends along its own axial direction and is inserted into the strip-shaped slot hole, and can contact the limit stop point to realize stop point stopping.

[0062] The above intermediate push-pull rod stop point limiting structure has a simple structure and is easy to be processed, installed and arranged on the clamping block.

[0063] At the same time, it is easy to accurately adjust the position of the limit stop point by adjusting the above-mentioned adjusting screw, thereby accurately adjusting the stop point position of the intermediate push-pull rod, ensuring the precise movement of the attitude holding lever, avoiding the attitude holding lever from damaging the lever, and avoiding excessive resetting of the attitude holding lever, thereby increasing the time for locking and unlocking, and accelerating the rate of locking and unlocking.

[0064] Wherein, each clamping block has an upper clamping portion and a lower clamping portion;

[0065] The upper clamping part has two clamping parts, each of which is an inverted L-shaped structure, and the lower end surface of the lateral extension part of the inverted L-shaped structure of each clamping part is used to contact and connect with the upper edge of the metering shell, and the outer end of the lateral extension part of the inverted L-shaped structure of the clamping part in the extension direction has a V-shaped groove in the top view direction, and the grooves of the two clamping parts are used to contact with the outer side surfaces of the vertical shaft sleeve and the air outlet to realize lateral clamping and limiting;

[0066] The lower clamping part has a clamping block with an L-shaped structure, and the inner side profile of the vertical part and the upper side profile of the horizontal part of the clamping block are used to fit and contact with the middle and lower side profile of the outer convex surface of the metering shell.

[0067] The "up and down directions" mentioned in the present technical solution are consistent with the up and down directions of the movement's posture.

[0068] After adopting the clamping block with the upper clamping part and the lower clamping part, the technical solution can obtain better vertical and horizontal clamping and positioning effects, ensuring accurate transfer and smooth subsequent assembly operations.

[0069] like Figure 5 As shown, the pointer assembly placement tooling is used to fix the pointer assembly upside down and make the lower section of the camshaft face upwards; the pointer assembly placement tooling includes a bottom plate and a positioning plate;

[0070] The bottom plate is used for laying on the transmission belt for transmission and assembly, the positioning plate is fixedly installed on the upper surface of the bottom plate, and 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 transmission direction of the conveyor belt;

[0071] The rocker arm positioning structure comprises two positioning posts arranged at intervals in the vertical transmission belt transmission direction, and the upper surfaces of the two positioning posts are respectively provided with positioning pins for inserting into corresponding positioning holes on the rocker arm in the pointer assembly;

[0072] The pointer positioning structure includes a positioning groove in which the pointer and the dial can be embedded;

[0073] The guide rod frame positioning structure includes two positioning protrusions arranged at intervals in the transmission direction of the vertical transmission belt, and the opposite inner sides of the two positioning protrusions are provided with insertion positioning grooves for the bending parts and the end sections of the two ends of the guide rod frame to be inserted and realize horizontal and vertical positioning.

[0074] The advantage of using the above-mentioned pointer assembly to place the tooling is that the rocker arm positioning structure in the above-mentioned positioning plate can be used to ensure that the rocker arm is in the correct assembly posture before press-fitting, thereby ensuring that the assembly shaft on the rocker arm can be aligned and inserted into the corresponding assembly hole on the movement.

[0075] By adopting the pointer positioning structure in the positioning plate, the pointer can be ensured to point to the predetermined correct position and be maintained in the positioning groove. When the pointer points to and is maintained, the position of the camshaft and its gear teeth can be determined and maintained, thereby creating conditions for the accurate and smooth assembly between the camshaft and the outlet wheel.

[0076] By adopting the guide rod frame positioning structure in the positioning plate, the guide rod frame for guiding the sliding of the valve cover can have a correct assembly posture.

[0077] During implementation, the insertion positioning groove on each positioning protrusion is preferably formed on a vertical surface where a horizontal section and a vertical section of a T-shaped member meet; the positioning protrusion is provided with a vertical assembly groove for the vertical section of the T-shaped member to be inserted, and the horizontal section of the T-shaped member overlaps the upper surface of the assembly groove;

[0078] A through connection hole is provided between the positioning protrusion and the T-shaped member, a latch is inserted into the connection hole to achieve fixed connection of the T-shaped member on the positioning protrusion, and both ends of the latch are exposed and locked by a locking piece.

[0079] The advantages of using the assembly structure between the T-shaped member and the positioning protrusion are:

[0080] 1. Because the guide rod frame is relatively thin (less than 2mm in diameter), the machining accuracy of the insert positioning groove is required to be high; the use of the above-mentioned T-shaped member can be independent of the structural design of the positioning protrusion, which can greatly reduce the machining difficulty of the insert positioning groove on the positioning plate, and can also avoid the situation where the entire positioning plate is scrapped when the insert positioning groove on the positioning plate does not meet the machining requirements.

[0081] 2. T-shaped components are not only easy to process, but also easy to assemble stably, and have better design and use effects.

[0082] Among them, the positioning plate as a whole is a rectangular plate-shaped structure, and mounting holes are provided at the four top corners of the positioning plate. Each mounting hole is fixedly connected to the internal threaded hole of the upper section of the internal and external thread connecting bolts fixed at the lower end on the base plate through a connecting screw.

[0083] In this way, the precise setting height of the positioning plate can be accurately adjusted by the height of the internal and external thread connecting bolts, thereby better ensuring the requirements of high-precision automated assembly.

[0084] C. Exit wheel and exit wheel feeding mechanism, such as Figures 6 to 9 Shown

[0085] The outlet wheel comprises an assembly shaft cylinder, one end of which is fixedly connected to a driving disc, and the driving disc is provided with driving teeth;

[0086] The driving teeth include a plurality of driving protrusions in a bullet-shaped structure arranged on the end surface of the driving disc away from the assembly shaft cylinder, and the plurality of driving protrusions are evenly spaced around the edge of the driving disc;

[0087] A columnar boss for adjusting the loading posture is arranged on the outer side of the assembly shaft cylinder. The boss for adjusting the loading posture has a pair of back-to-back and mutually parallel posture adjustment planes and a pair of back-to-back and equal-diameter arc surfaces in the circumferential direction. The spacing between the pair of posture adjustment planes is smaller than the diameter of the arc surface.

[0088] The advantages of the outlet wheel structure adopted in this technical solution are:

[0089] 1. The distance between a pair of posture adjustment planes on the outlet wheel is shorter than the diameter of the arc surface of the feeding posture adjustment shoulder, and the pair of posture adjustment planes form a narrowed structure, so that it is easy to set an entrance with the same width as the distance between the two posture adjustment planes at the entrance of the outlet wheel terminal feeding channel on the outlet wheel vibration feeding plate. In this way, the posture of the outlet wheel entering the terminal feeding channel of the outlet wheel can be adjusted and corrected, so as to better control the posture of the outlet wheel to be used for feeding and assembly.

[0090] 2. The driving protrusions with the above structure and layout can form a gap between two adjacent driving protrusions that is not easily damaged by compression and can be reliably assembled and used, thereby facilitating the correct and reliable automated precision assembly between the outlet wheel and the camshaft.

[0091] Among them, two posture adjustment protrusions are arranged on the end face of the driving disc on which the driving protrusion is arranged, and the two posture adjustment protrusions are spaced apart on a single diameter of the driving disc, and the single diameter is parallel to the posture adjustment plane, and the driving protrusion and the posture adjustment protrusion are mirror-symmetrical about the single diameter, and the head and tail of the single diameter just pass through the gap between two adjacent driving protrusions.

[0092] Because, after the exit wheel is loaded through the vibrating plate, it will enter a fixed exit wheel pickup position that can only accommodate a single exit wheel through the exit wheel end loading channel. In the process of entering the exit wheel pickup position, there is no limiting structure, so the posture of the exit wheel is very easy to change, so it is impossible to effectively ensure that the exit wheel to be taken away and assembled has the correct posture.

[0093] In the present technical solution, after adopting the structure of the above-mentioned two posture adjustment protrusions and driving teeth, a hard straight metal wire parallel to the above-mentioned single diameter can be set on the exit wheel pickup position to contact with one side of the two posture adjustment protrusions after passing through the gap between two adjacent driving teeth, and a "straight line" is determined by the two contact points, thereby effectively ensuring that the exit wheel has the same correct posture from the end of the vibration disk and when it moves to the exit wheel pickup position, thereby effectively ensuring the subsequent correct and accurate automatic assembly.

[0094] At the same time, the rigid straight wire cooperates with the exit wheel to ensure the correct posture of the structure, and will not have an adverse effect on the smooth material removal of the exit wheel, ensuring that the exit wheel can be smoothly and reliably removed.

[0095] The protrusion for posture adjustment has a smaller protrusion height than the protrusion for driving; the protrusion for posture adjustment has a cubic structure at a section close to the driving disc in the protrusion direction, and a pyramid structure at a section away from the driving disc.

[0096] In this way, the upper pyramid structure of the posture adjustment protrusion makes it easier for the protruding outer end of the stiff straight metal wire to enter the surrounding annular area of ​​the pyramid structure, and finally get stuck in the gap between the cubic structure of the posture adjustment protrusion and the adjacent driving protrusion to achieve contact with the two adjustment protrusions and ensure that the exit wheel at the exit wheel picking position has the correct posture.

[0097] The outlet wheel feeding mechanism includes an outlet wheel vibrating feeding plate and an outlet wheel picking position;

[0098] The outlet wheel taking position has a V-shaped outlet wheel taking-out groove which is V-shaped in a top view direction, the opening of the V-shaped outlet wheel taking-out groove is connected to the outlet of the outlet wheel end section loading channel of the outlet wheel vibrating loading tray, and the V-shaped outlet wheel taking-out groove can just accommodate a single outlet wheel;

[0099] Features:

[0100] The outlet wheel end feeding channel of the outlet wheel vibrating feeding tray is an inverted T-shaped groove structure, and the groove width of the vertical part of the inverted T-shaped groove is close to the distance between the two posture adjustment planes on a single outlet wheel.

[0101] In this way, the feeding channel at the end of the exit wheel can only be in one posture, that is, the two posture adjustment planes on a single exit wheel can just enter the posture of the vertical part of the T-slot. This posture can also be determined for conveying and picking up materials, which can effectively ensure the certainty of the posture during subsequent assembly and is conducive to correct and smooth automatic assembly.

[0102] Among them, a stiff straight metal wire is fixedly arranged on the lateral side wall of the V-shaped groove for removing the outlet wheel near the tip, and the stiff straight metal wire extends straight out of the notch of the V-shaped groove for removing the outlet wheel. The stiff straight metal wire is used to insert into the gap between the posture adjustment protrusion and the adjacent driving protrusion, and can contact the two posture adjustment protrusions of a single outlet wheel.

[0103] The above-mentioned straight metal wire can cooperate with the two adjustment protrusions arranged on the outlet wheel to ensure that the outlet wheel has a correct assembly posture during the process of moving from the outlet wheel end feeding channel to the outlet wheel picking position.

[0104] As described above, the two adjustment protrusions arranged on the above-mentioned straight metal wire and the outlet wheel can achieve low cost and obtain good and reliable use effect through an extremely simple and effective structure.

[0105] D. Crank feeding mechanism, such as Fig.10 and Fig.11 Shown

[0106] The crank loading mechanism comprises a crank vibrating loading plate and a crank taking position; the crank taking position has a V-shaped crank taking V-shaped groove in a top view, the bottom of the V-shaped groove has a groove for inserting the connecting shaft of the crank; the opening of the V-shaped groove is connected to the outlet of the crank end loading channel of the crank vibrating loading plate, and the V-shaped groove can just accommodate a single crank;

[0107] The feeding channel at the end of the crank is a cross-shaped groove structure, and the connecting shaft of the crank faces downward and the shifting rod of the crank faces upward to pass through two vertical notches of the cross-shaped groove for transmission;

[0108] A pair of shift rods are fixed on the upper surface of the cross-shaped groove structure at the end of the crank end feeding channel, and the pair of shift rods extend to the entrance of the V-shaped groove for removing the crank, and the pair of shift rods gradually approach each other along the extending direction and the distance between the closest parts is close to the diameter of the shift rod.

[0109] Similarly, it is necessary to effectively ensure that the outlet wheel in the crank assembly and the camshaft in the pointer assembly have the correct assembly posture, and the technical route adopted in this technical solution is:

[0110] The coaxially fixed outlet wheel is locked by locking the crank in the crank assembly, so the press-fitting posture between the outlet wheel and the crank is also the key to ensuring whether the outlet wheel in the subsequent crank assembly and the camshaft in the pointer assembly can be accurately assembled.

[0111] The crank feeding mechanism in the present technical solution has a pair of gear rods fixed on the upper surface of the cross-groove structure at the end of the feeding channel at the end section of the crank. The position of the shift rod on the crank can be adjusted by the pair of gear rods, so that the crank entering the crank picking position can have a predetermined correct assembly posture, thereby laying a good foundation for subsequent precise assembly.

[0112] Wherein, an air injection pipe (not shown in the figure) is arranged on the outer side of the feeding channel of the end section of the crank, and the air injection port of the air injection pipe faces the entrance of the feeding channel of the end section of the crank.

[0113] Because the crank is a plastic part, it is light in weight; the entrance of the feeding channel at the end of the crank can only accommodate a single crank, so the entrance is narrow and easily blocked during the vibration material transfer process. After the above-mentioned air jet pipe is set, the crank that has just entered can be quickly removed by air jet, so that the next crank can smoothly enter the entrance of the feeding channel at the end of the crank, which better ensures smooth feeding.

[0114] During implementation, the air inlet of the air jet pipe is connected to an air source (a fan, an air pump or a high-pressure air source).

[0115] E. Crank assembly assembly tooling, such as Figures 12 to 15 Shown

[0116] A crank assembly assembly tool, including a tool base;

[0117] Also included are a cylindrical seat and a bottom positioning support;

[0118] The cylindrical seat is fixedly mounted on the upper surface of the tooling base, and the cylindrical opening of the cylindrical seat can be coaxially inserted into the driving disc of the outlet wheel; the circumferential side wall of the cylindrical seat is provided with a support positioning slot hole for the clamping block on the support in the crank assembly to be clamped and positioned; the circumferential side wall of the cylindrical seat is also provided with a photoelectric detection hole for detecting whether the outlet wheel is placed in place;

[0119] The bottom positioning support is coaxially fixed to the inner bottom of the cylindrical seat. The bottom positioning support is a cylindrical structure as a whole. The upper surface of the cylindrical structure constitutes a press-fit support surface. A convex positioning column is provided in the middle of the press-fit support surface. The positioning column is used to be inserted into the positioning hole in the center of the driving disc of the outlet wheel, and the upper end of the positioning column can be used to abut against the connecting shaft of the crank that is pressed in to limit the position.

[0120] The press-fitting support surface is provided with an annular groove for the posture adjustment protrusion on the outlet wheel to fall into;

[0121] An annular cavity is provided between the outer circumferential surface of the columnar structure and the inner side surface of the cylindrical seat for inserting the driving teeth on the driving disc of the outlet wheel.

[0122] The crank assembly assembly tooling has a simple structure and is easy to process and arrange. It can detect whether the outlet wheel in the crank assembly is in place and can also ensure accurate positioning during the press-fitting process of the support.

[0123] The positioning column on the bottom positioning support can not only accurately position the outlet wheel, but also be used to form a compression stop point of the connecting shaft of the crank, thereby ensuring the correct assembly of the crank assembly itself.

[0124] The lower surface of the cylindrical seat is provided with a non-cylindrical plug-in boss, and a cylindrical hole is provided through the plug-in boss; the upper surface of the tooling base has a positioning assembly socket for inserting the plug-in boss, and the lower surface of the tooling base is provided with a countersunk hole connected to the positioning assembly socket;

[0125] The lower surface of the bottom positioning support is provided with a downward convex assembly plug-in cylinder for being inserted into the cylindrical hole, and the lower end surface of the assembly plug-in cylinder is processed and provided with a threaded hole;

[0126] The bottom positioning support is inserted into the cylindrical hole of the cylindrical seat by means of an assembly plug-in cylinder, and the cylindrical seat is inserted into the positioning assembly socket of the tooling base by means of an insertion boss. The assembly and fixation of the cylindrical seat and the bottom positioning support on the tooling base is achieved by means of a threaded connection between a locking screw arranged in the countersunk hole and the threaded hole.

[0127] The structural design of the assembly and fixation of the above cylindrical seat and the bottom positioning support on the tooling base is ingenious, and makes the cylindrical seat and the bottom positioning support have more functions: not only can it be used for the press-fitting of the crank assembly, but also can play the role of a fixed connecting piece, so that the cylindrical seat and the bottom positioning support can be accurately assembled and fixed on the tooling base through the matching structure between themselves and the tooling base, which has a better use effect and simplifies the structural design and the use of connecting components.

[0128] The outer side surface of the upper section of the columnar structure of the bottom positioning support is provided with a through hole penetrating along a single diameter in the circumferential direction, and correspondingly, the circumferential side wall of the cylindrical seat is provided with a through hole capable of aligning with the through hole and penetrating therethrough;

[0129] An anti-rotation rod is arranged through the through hole and the through hole, the diameter of the anti-rotation rod and the diameter of the through hole are close to each other, and the anti-rotation rod can be just inserted into the gap between two adjacent driving protrusions on the outlet wheel; the two ends of the anti-rotation rod are located outside the cylindrical seat and are fixedly connected with limiting nuts through threads.

[0130] With the above structure, the anti-rotation rod can effectively prevent the bottom positioning support from rotating in the circumferential direction, so that the outlet wheel can maintain a fixed correct posture during the crank assembly press-fitting process.

[0131] Furthermore, the anti-rotation rod can be inserted exactly into the gap between two adjacent driving protrusions on the outlet wheel, that is, the thickness and diameter of the anti-rotation rod is consistent with the gap width between the two adjacent driving protrusions on the outlet wheel. In this way, whether there is a collision between the anti-rotation rod and the driving protrusion can be used to further determine whether the outlet wheel is in the correct posture (the determination method is: because the outlet wheel is transferred and placed on the tooling by a preset manipulator, the moving stroke of the manipulator and the change in placement resistance and other parameters are used to determine whether the outlet wheel is in the correct press-fitting posture), laying a good foundation for the subsequent correct assembly between the outlet wheel and the camshaft.

[0132] F. Crank assembly system

[0133] The crank assembly assembly system includes a four-station turntable (not shown in the figure) and a crank assembly assembly tool fixedly installed at each station on the four-station turntable;

[0134] It also includes an outlet wheel feeding mechanism, a support feeding mechanism, a crank feeding mechanism and a material taking mechanism which are fixedly installed in sequence on the outside of the four-station turntable along the rotation direction of the four-station turntable.

[0135] In this way, the crank assembly assembly tooling on the four-station turntable can be fully utilized, and the outer space of the four-station turntable can be fully utilized to arrange the mouth wheel feeding mechanism, the support feeding mechanism, the crank feeding mechanism and the picking mechanism, so that the structural design of the crank assembly system is reasonable and the space utilization is more effective.

[0136] The above are only preferred implementations of the present invention. It should be pointed out that a number of modifications and improved technical solutions made by those skilled in the art without departing from the present technical solution should also be deemed to fall within the scope of protection required by the claims of this application.

Claims

1. A crank assembly and camshaft assembly device, comprising a transfer assembly clamping cylinder and a pointer assembly placement tool, wherein the transfer assembly clamping cylinder has a pair of clamping blocks for clamping the movement; characterized in that: Also included is an exit wheel posture holding mechanism for locking the posture of the exit wheel during assembly; The pointer assembly placement tool is used to load the pointer assembly with a correct assembly posture. The pointer assembly placement tool is provided with a positioning structure for positioning various parts of the pointer assembly. The positioning structure can maintain the correct assembly posture of the loaded pointer assembly. The exit wheel posture maintaining mechanism comprises a posture maintaining cylinder, an intermediate push-pull rod and a posture maintaining lever; One of the pair of clamping blocks of the transfer assembly clamping claw cylinder, which is close to the crank, is a posture maintaining mounting block, the posture maintaining cylinder is fixedly mounted on the outer side of the posture maintaining mounting block, the push rod of the posture maintaining cylinder is telescopic in the vertical direction and is hingedly connected to one end of the intermediate push-pull rod, the other end of the intermediate push-pull rod is used to be hingedly connected to one end of the posture maintaining lever, the middle part of the posture maintaining lever in the length direction is rotatable on the vertical end side of the posture maintaining mounting block through a pivot, and the other end of the posture maintaining lever constitutes a locking end for pressing and keeping the crank's shift rod locked; The pointer assembly placement tool is used to fix the pointer assembly upside down so that the lower section of the camshaft faces upwards; the pointer assembly placement tool includes a bottom plate and a positioning plate; The bottom plate is used for laying on the transmission belt for transmission and assembly, the positioning plate is fixedly installed on the upper surface of the bottom plate, and 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 transmission direction of the conveyor belt; The rocker arm positioning structure comprises two positioning posts arranged at intervals in the vertical transmission belt transmission direction, and the upper surfaces of the two positioning posts are respectively provided with positioning pins for inserting into corresponding positioning holes on the rocker arm in the pointer assembly; The pointer positioning structure includes a positioning groove in which the pointer and the dial can be embedded; The guide rod frame positioning structure includes two positioning protrusions arranged at intervals in the transmission direction of the vertical transmission belt, and the opposite inner sides of the two positioning protrusions are provided with insertion positioning grooves for the bending parts and the end sections of the two ends of the guide rod frame to be inserted and realize horizontal and vertical positioning.

2. The crank assembly and camshaft assembly device according to claim 1, characterized in that: The locking end of the retaining lever is used to contact the crank's shift rod and has a limiting groove with a V-shaped cross-section. 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.

3. The crank assembly and camshaft assembly device according to claim 2, characterized in that: A positioning groove is provided at the bottom of the opening end of the limiting groove. The groove width of the positioning groove is consistent with the radial thickness of the shifting rod on the crank and can allow the shifting rod to be just inserted and accurately locked.

4. The crank assembly and camshaft assembly device according to claim 1, characterized in that: The exit wheel posture maintaining mechanism also includes an intermediate push-pull rod stop point limiting structure, and the intermediate push-pull rod stop point limiting structure includes a fixed block, and the fixed block is fixedly installed with the outer side surface of the posture maintaining mounting block, and the fixed block is provided with a strip slot extending in the vertical direction, and the upper and lower end surfaces of the fixed block are each screwed with an adjusting screw through a thread, and the end of the adjusting screw away from the bolt head is located in the strip slot to form a limit stop point; The connecting pin shaft between the intermediate push-pull rod and the push rod extends along its own axial direction and is inserted into the strip-shaped slot hole, and can contact the limit stop point to realize stop point stopping.

5. The crank assembly and camshaft assembly device according to claim 1, characterized in that: Each clamping block has an upper clamping portion and a lower clamping portion; The upper clamping part has two clamping parts, each of which is an inverted L-shaped structure, and the lower end surface of the lateral extension part of the inverted L-shaped structure of each clamping part is used to contact and connect with the upper edge of the metering shell, and the outer end of the lateral extension part of the inverted L-shaped structure of the clamping part in the extension direction has a V-shaped groove in the top view direction, and the grooves of the two clamping parts are used to contact with the outer side surfaces of the vertical shaft sleeve and the air outlet to realize lateral clamping and limiting; The lower clamping part has a clamping block with an L-shaped structure, and the inner side profile of the vertical part and the upper side profile of the horizontal part of the clamping block are used to fit and contact with the middle and lower side profile of the outer convex surface of the metering shell.

6. The crank assembly and camshaft assembly device according to claim 1, characterized in that: The positioning plate is a rectangular plate structure as a whole, and mounting holes are provided at the four top corners of the positioning plate. Each mounting hole is threadedly fixedly connected to the internal threaded hole of the upper section of the internal and external thread connecting bolts fixed at the lower end on the base plate through a connecting screw.

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