A quality inspection and conveying device for automobile crankshaft

Abstract

The present invention discloses a quality inspection and conveying device for automobile crankshafts, comprising a loading conveying device, a side-pull conveying device, a quality inspection platform, a lifting conveying device, a first transfer conveying device, a buffer conveying device, a second transfer conveying device, a unloading conveying device and an electric control device. The quality inspection and conveying device for automobile crankshafts provided by the present invention has a high degree of automation, which is convenient for quality inspectors to perform appearance quality inspection on each automobile crankshaft, reduces the labor intensity of quality inspectors, and prevents defective products from entering the market; and the reasonable setting of each device realizes the mixed inspection of two or more types of automobile crankshafts and the classified buffering of qualified products, which improves the inspection applicability and flexibility of the quality conveying device.

Description

Technical Field

[0001] The invention relates to the field of automobile crankshaft quality inspection equipment, and in particular to a quality inspection and conveying device for automobile crankshafts. Background Art

[0002] Automobile crankshafts are important components of automobile engines. Newly produced automobile crankshafts cannot be loaded directly onto vehicles because they have not yet undergone quality inspection. The finished automobile crankshafts will be stored in the warehouse waiting for quality inspection, and then the finished automobile crankshafts will be inspected for appearance through quality inspection conveying devices. Only after the finished automobile crankshafts are judged to be qualified will they be sent to the loading site by transport vehicles.

[0003] The existing quality inspection and handling device is mainly composed of a loading conveyor line, a quality inspection table and a unloading conveyor line. In order to facilitate transportation, the finished automobile crankshaft (i.e., the workpiece) will be placed on a pallet; the loading conveyor line will transport the pallet carrying the finished automobile crankshaft to the quality inspection table for appearance quality inspection. If the finished automobile crankshaft is judged to be qualified, the pallet carrying the qualified product will be transported to the unloading conveyor line for caching, and finally transported to the loading place by a transport trolley. After the loading is completed, the empty pallet generated will be sent back to the loading conveyor line by the transport trolley. The current quality inspection and handling device has the following shortcomings: 1. During operation, it can only realize quality inspection of a single type of automobile crankshaft, and cannot realize mixed inspection and classified storage of two or more types of automobile crankshafts, and has low flexibility and applicability; 2. The existing manual quality inspection table has a low degree of automation, and the operator needs to carry the workpieces one by one to the manual quality inspection table by manual transportation. After the quality inspection is completed, the workpiece needs to be transported to the unloading conveyor line again, which is quite time-consuming and laborious; 3. The unloading conveyor line does not have the function of returning empty pallets, and can only rely on the transport trolley to return to the loading conveyor line.

[0004] It can be seen that the existing quality inspection and handling devices are in urgent need of improvement and enhancement. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a quality inspection and conveying device for automobile crankshafts, aiming to solve the problem that the prior art can only perform quality inspection on a single model of automobile crankshafts, and cannot realize mixed inspection and classified storage of two or more types of automobile crankshafts.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A quality inspection and conveying device for automobile crankshafts, comprising a loading conveying device, a side-pull conveying device, a quality inspection platform, a lifting conveying device, a first transfer conveying device, a buffer conveying device, a second transfer conveying device, a unloading conveying device and an electric control device; the loading conveying device is used to identify the model and placement posture of the pallet and convey the pallet carrying the workpiece forward; the side-pull conveying device is used to guide the pallet to be pulled sideways to the quality inspection platform; the quality inspection platform is used to perform qualified inspection on the workpiece; the lifting conveying device is used to pair and identify qualified products with the pallet, and convey the pallet carrying the qualified products to the first transfer conveying device; the buffer conveying device is provided with two or more , these cache conveying devices are arranged in parallel, and each of the cache conveying devices can cache multiple qualified products; the first transfer conveying device is used to transport the pallet carrying qualified products to the corresponding cache conveying device to realize classified caching; the second transfer conveying device is used to transport the pallet carrying qualified products in the cache conveying device to the unloading conveying device; the unloading conveying device is used to transport the pallet carrying qualified products to the transport trolley; the loading conveying device, the side-pull conveying device, the quality inspection table, the lifting conveying device, the first transfer conveying device, the cache conveying device, the second transfer conveying device, and the unloading conveying device are all electrically connected to the electronic control device, and their operation is controlled by the electronic control device.

[0008] The loading and conveying device includes a first frame, a first roller conveying mechanism arranged on the first frame, and a first sensing component and a first blocking mechanism arranged on the first roller conveying mechanism; each pallet is provided with an identification module arranged at a predetermined position, and the first sensing component is used to sense the setting position of the identification module on the pallet and feed back the sensing signal to the electronic control device; the first blocking mechanism is used to prevent the pallet from being conveyed forward.

[0009] The side-pull conveying device includes a second frame, a second roller conveying mechanism arranged on the second frame, a rib arranged on the second roller conveying mechanism, a roller group and a lifting mechanism for driving the roller group to rise and fall, and the roller group extends toward the direction of the quality inspection platform.

[0010] The quality inspection platform includes a third frame, a transport panel and a base plate arranged on the third frame, and a first lifting mechanism arranged on the base plate, the transport panel is located above the base plate, the first lifting mechanism includes a mounting plate, a lifting arm arranged on the mounting plate, and a first cylinder for driving the mounting plate to move vertically relative to the base plate, the lifting arm is used to lift the workpiece placed on the transport panel, the lifting arm includes a support arm fixedly arranged on the mounting plate and a positioning structure arranged on the free end of the support arm, the positioning structure includes two positioning wheels fixedly arranged on the side of the support arm, and a V-shaped receiving station is formed between the two positioning wheels.

[0011] A position adjustment device for driving the lifting arm to move laterally is provided on the mounting plate, and the position adjustment device includes a guide rail, a slider, and a second cylinder; the guide rail extends along the axial length direction of the workpiece, and the bottom of the support arm is slidably connected to the guide rail through the slider, and the second cylinder is used to drive the support arm and the slider to move.

[0012] The lifting and conveying device includes a lifting frame, a base frame, a second lifting mechanism arranged on the base frame, and a third roller conveying mechanism arranged on the lifting frame, wherein the second lifting mechanism is used to drive the lifting frame to move vertically relative to the base frame; the third roller conveying mechanism is provided with a lifting and thrust mechanism, and the third roller conveying mechanism is provided with a second sensing component and a third sensing component, the second sensing component is used to sense the setting position of the identification module on the pallet and feed back the sensing signal to the electronic control device; the third sensing component is used to identify the type of the workpiece; and the lifting and thrust mechanism is used to prevent the pallet from being conveyed forward.

[0013] The first transfer and conveying device and the second transfer and conveying device both include a base, a slide slidably arranged on the top of the base, an upper transfer roller conveying mechanism and a lower transfer roller conveying mechanism arranged on the slide, and a slide driving mechanism; the upper transfer roller conveying mechanism is located above the lower transfer roller conveying mechanism, the upper transfer roller conveying mechanism of the first transfer and conveying device is provided with a second blocking mechanism for blocking the pallet from being conveyed forward, and the upper transfer roller conveying mechanism of the second transfer and conveying device is provided with a third blocking mechanism for blocking the pallet from being conveyed forward; the slide driving mechanism is used to drive the slide to move horizontally in a direction perpendicular to the workpiece transportation direction.

[0014] Each of the cache conveying devices includes a fourth frame, a cache upper roller conveying mechanism arranged on the fourth frame, and a cache lower roller conveying mechanism. The cache upper roller conveying mechanism is located above the cache lower roller conveying mechanism. A plurality of upper cache stations are arranged on the cache upper roller conveying mechanism. The cache station closest to the output end of the cache upper roller conveying mechanism is the first cache station. A fourth blocking mechanism and a fifth blocking mechanism are respectively arranged on the front and rear sides of the first cache station. The fourth blocking mechanism is used to block the pallet on the first cache station from being conveyed forward, and the fifth blocking mechanism is used to block the pallet on the cache station located on the rear side of the first cache station from being conveyed forward.

[0015] The unloading conveying device includes a fifth frame, an unloading roller conveying mechanism and a pallet return roller conveying mechanism arranged on the fifth frame; the unloading roller conveying mechanism is located above the pallet return roller conveying mechanism, and a sixth blocking mechanism for blocking the forward conveyance of the pallet is arranged on the output end of the unloading roller conveying mechanism.

[0016] The pallet return roller conveyor mechanism is provided with a fourth sensing component and a seventh blocking mechanism; the fourth sensing component is used to sense the setting position of the identification module on the empty pallet and feed back the sensing signal to the electronic control device; the seventh blocking mechanism is used to block the empty pallet from being conveyed forward.

[0017] Beneficial effects:

[0018] The present invention provides a quality inspection and conveying device for automobile crankshafts. When working, an empty pallet will be conveyed to a loading and conveying device, which senses the empty pallet and feeds back the sensing signal to an electronic control device, which analyzes the type and placement posture of the pallet according to the sensing signal; the electronic control device controls a handling robot to transport finished automobile crankshafts of corresponding models to the empty pallet according to the type of the pallet; the quality inspector pulls the pallet carrying the workpieces to the quality inspection table for appearance inspection, and the pallet carrying qualified products will be pushed to a lifting and conveying device, which pairs and identifies the qualified products and the pallet. If the pallet is correctly paired with the qualified products, the lifting and conveying device transports the pallet carrying the qualified products to a first transferring and conveying device; the first transferring and conveying device transports the pallet carrying the qualified products to a corresponding cache conveying device according to the type of the qualified products to achieve classified caching. It can be seen that the quality inspection and conveying device for automobile crankshafts provided by the present invention has a high degree of automation, which is convenient for quality inspectors to conduct appearance quality inspection on each automobile crankshaft, reduces the labor intensity of quality inspectors, and prevents defective products from entering the market; and the reasonable setting of each device realizes mixed inspection of two or more types of automobile crankshafts and classified caching of qualified products, thereby improving the inspection applicability and flexibility of the quality conveying device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of the quality inspection and conveying device provided by the present invention.

[0020] Figure 2 This is a three-dimensional diagram of the loading conveying device in the quality inspection conveying device provided by the present invention.

[0021] Figure 3 for Figure 2 A partial enlarged view of the middle L area.

[0022] Figure 4 This is a schematic structural diagram of the roller conveying mechanism in the quality inspection conveying device provided by the present invention.

[0023] Figure 5 A three-dimensional diagram of a tray in the quality inspection and conveying device provided by the present invention.

[0024] Figure 6 This is a top view of the first tray in the quality inspection and conveying device provided by the present invention.

[0025] Figure 7This is a top view of the second tray in the quality inspection and conveying device provided by the present invention.

[0026] Figure 8 A top view showing a first tray in a correct placement position on a loading conveyor device in the quality inspection conveyor device provided by the present invention.

[0027] Fig. 9 A top view of a first tray in the quality inspection conveying device provided by the present invention placed upside down on the loading conveying device.

[0028] Fig.10 A top view showing the second tray in the quality inspection conveying device provided by the present invention being placed in the correct posture on the loading conveying device.

[0029] Fig.11 A top view of a second tray in the quality inspection conveying device provided by the present invention placed upside down on the loading conveying device.

[0030] Fig.12 A three-dimensional diagram of a quality inspection table in the quality inspection and conveying device provided by the present invention.

[0031] Fig.13 This is a three-dimensional diagram of the quality inspection table in the quality inspection and conveying device provided by the present invention when inspecting a workpiece.

[0032] Fig.14 A three-dimensional diagram of the lifting and conveying device in the quality inspection and conveying device provided by the present invention.

[0033] Fig.15 A top view showing a first tray in a correct placement position on a lifting conveyor device in the quality inspection conveyor device provided by the present invention.

[0034] Fig.16 A top view of a first tray in the quality inspection conveying device provided by the present invention, which is placed upside down on the lifting conveying device.

[0035] Fig.17 A top view showing a second tray in a correct placement position on the lifting conveyor device in the quality inspection conveyor device provided by the present invention.

[0036] Fig.18 A top view of a second tray in the quality inspection conveying device provided by the present invention placed upside down on the lifting conveying device.

[0037] Fig.19 A three-dimensional diagram of a first transfer and conveying device and a second transfer and conveying device in the quality inspection and conveying device provided by the present invention.

[0038] Fig. 20 A three-dimensional diagram of a cache conveying device in the quality inspection conveying device provided by the present invention.

[0039] Fig.21 for Fig. 20 A partial enlarged view of the middle S region.

[0040] Fig. 22 A top view of the buffer upper roller conveying mechanism in the quality inspection conveying device provided by the present invention.

[0041] Fig.23 This is a three-dimensional diagram of the material unloading conveying device in the quality inspection conveying device provided by the present invention. DETAILED DESCRIPTION

[0042] The present invention provides a quality inspection and conveying device for automobile crankshafts. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] In this article, front refers to the direction in which each device transports the workpiece forward, and front and rear are opposite directions.

[0044] See also Figure 1-23 The present invention provides a quality inspection and conveying device for automobile crankshafts, comprising a loading conveying device A, a side-pull conveying device B, a quality inspection platform C, a lifting conveying device D, a first transfer conveying device E, a buffer conveying device F, a second transfer conveying device G, a unloading conveying device H and an electric control device; the loading conveying device A is used to identify the model and placement posture of the pallet, and to convey the pallet carrying the workpiece forward; the side-pull conveying device B is used to guide the pallet to be pulled sideways to the quality inspection platform C; the quality inspection platform C is used to perform qualified inspection on the workpiece; the lifting conveying device D is used to pair and identify qualified products with the pallet, and convey the pallet carrying the qualified products to the first transfer conveying device E, and the buffer conveying device F is provided with two or more There are more than two of these cache conveying devices F, which are arranged in parallel, and the cache conveying device F can cache multiple qualified products; the first transfer conveying device E is used to transport the pallet carrying qualified products to the corresponding cache conveying device to realize classified caching; the second transfer conveying device G is used to transport the pallet carrying qualified products in the cache conveying device F to the unloading conveying device H; the unloading conveying device H is used to transport the pallet carrying qualified products to the transport trolley; the loading conveying device A, the side pull conveying device B, the quality inspection table C, the lifting conveying device D, the first transfer conveying device E, the cache conveying device F, the second transfer conveying device G, and the unloading conveying device H are all electrically connected to the electronic control device, and their operation is controlled by the electronic control device.

[0045] During operation, the empty pallet will be transported to the loading conveyor device A, which will sense the empty pallet and feed back the sensing signal to the electronic control device. The electronic control device will analyze the type and placement of the pallet based on the sensing signal. If the placement is reversed, the electronic control device will issue a reminder to allow the quality inspector to straighten the empty pallet. The electronic control device will control the handling robot to move the corresponding model of automobile crankshaft finished products to the empty pallet according to the type of pallet, and then transport the pallet carrying the workpiece to the side-pull conveyor device B. The quality inspector will pull the pallet carrying the workpiece to the quality inspection table for appearance inspection. If the workpiece inspection fails, the quality inspector will move the workpiece to the unqualified product storage rack. If the workpiece inspection passes, the pallet carrying qualified products will be pushed to the lifting conveyor device D. The lifting conveyor device D will pair and identify the qualified products and pallets. If the model of the pallet matches that of the qualified product and the placement of the pallet is correct, the lifting conveyor device D will The tray is transported to the first transfer and conveying device E; if the tray and the qualified product are paired incorrectly, the quality inspector will re-pair the tray and the qualified product; the first transfer and conveying device E transports the tray carrying the qualified product to the corresponding buffer conveying device F according to the type of qualified product to realize classified caching; when the transport cart requests to transport a certain type of qualified product, the second transfer and conveying device G will move to the corresponding buffer conveying device F to take the qualified product, and then the qualified product will be transported to the unloading conveying device H to wait for transportation, and the unloading conveying device H will then transport the qualified product to the transport cart, and finally the transport cart will transport the automobile crankshaft to the loading site. Therefore, the quality inspection and conveying device of the automobile crankshaft provided by the present invention has a high degree of automation, which is convenient for the quality inspector to perform appearance quality inspection on each automobile crankshaft, reduces the labor intensity of the quality inspector, and avoids the influx of defective products into the market; and the reasonable setting of each device realizes the mixed inspection of two or more types of automobile crankshafts and the classified caching of qualified products, and improves the inspection applicability and flexibility of the quality conveying device.

[0046] The electric control device includes a PLC controller and related control circuits.

[0047] In this embodiment, see Figure 2As shown, the feeding conveying device A includes a first frame A1, a first roller conveying mechanism A2 arranged on the first frame A1, and a first sensing component A3 and a first blocking mechanism A4 arranged on the first roller conveying mechanism A2; each pallet J is provided with an identification module K arranged at a predetermined position, the first sensing component A3 is used to sense the setting position of the identification module on the pallet, and feed back the sensing signal to the electronic control device; the first blocking mechanism A4 is used to block the pallet from being transported forward. Since different types of automobile crankshafts have different shaft lengths, different types of automobile crankshafts require special pallets for carrying; the first roller conveying mechanism A2 transports the empty pallet forward to the first detection station A5 (i.e., the position where the first sensing component can normally detect the pallet), and the first blocking mechanism A4 blocks the pallet from continuing to be transported forward to ensure that the pallet is located at the first detection station A5; the identification module on the pallet will cause some sensors of the first sensing component A3 to generate sensing signals, while the other sensors cannot generate sensing signals. At this time, the electronic control device will obtain the sensing signal of the first sensing component A3, and the electronic control device will obtain the pallet recognition result after analysis. Assuming there are N types of pallets, and the position of the identification module on each pallet is different, there will be N corresponding detection results, and the N detection results are different; in addition, the pallets may be placed in the correct posture or in the opposite posture, so adding the reversed detection result will result in a total of 2N detection results, and these 2N detection results are also different. Therefore, since each pallet identification result is unique, the electronic control device can not only determine the type of pallet based on the pallet identification result, but also detect whether the pallet is placed in reverse.

[0048] During operation, the first roller conveyor mechanism A2 conveys the empty pallet to the first inspection station A5, and the first blocking mechanism A4 prevents the empty pallet from moving forward; at this time, the first sensing component A3 senses the empty pallet and feeds back the sensing signal to the electronic control device. When the electronic control device determines the type of the pallet and the placement posture is correct, the electronic control device will control the handling robot to clamp the corresponding type of automobile crankshaft finished product to the pallet of the first inspection station A5, and then the first blocking mechanism A4 releases the blockage, and the first roller conveyor mechanism A2 transports the pallet carrying the workpiece forward; when the electronic control device determines that the pallet is placed upside down, the electronic control device will send a warning signal to notify the quality inspector to put the pallet back in the right position to ensure that the workpiece can be placed correctly on the pallet, so that the automobile crankshaft finished product can smoothly cooperate with the quality inspection table for quality inspection.

[0049] In this embodiment, the quality inspection and conveying device provided by the present invention is designed to perform quality inspection on two types of workpieces, such as the crankshaft of a 2.0L engine and the crankshaft of a 2.5L engine. The tray J includes a first tray J5 and a second tray J6. The first tray J5 is provided with a first identification module K1 and a first bearing seat J51, and the second tray J6 is provided with a second identification module K2 and a second bearing seat J61; the first bearing seat J51 is used to carry the first workpiece L1, and the second bearing seat J61 is used to carry the second workpiece L2; the first induction component A3 includes a first inductor A31, a second inductor A32 and a third inductor A33. For ease of explanation, the crankshaft of the 2.0L engine is the first workpiece L1, which is carried by the first tray J5; the crankshaft of the 2.5L engine is the second workpiece L2, which is carried by the second tray J6.

[0050] For details, see Figure 5 As shown, the pallet J has four corners, which are respectively set as the left front J1, the right front J2, the left rear J3, and the right rear J4; the identification module K will be selectively set on some corners of the pallet according to a predetermined design method to distinguish different types of pallets. The first sensor A31 is used to detect whether the identification module K is provided on the left front J1 of the pallet; the second sensor A32 is used to detect whether the identification module K is provided on the right front J2 of the pallet; the third sensor A33 is used to detect whether the identification module K is provided on any part of the left rear J3 and the right rear J4. Through such a setting, the structure of the pallet is reasonable and compact, avoiding interference between the identification module and the crankshaft of the car; and the detection method is simple and reasonable, the sensor usage is small, and the manufacturing cost is saved.

[0051] In one embodiment, the first recognition module K1 is a recognition protrusion disposed on the left rear portion J3 and the right rear portion J4 of the first tray J5, and the second recognition module K2 is a recognition protrusion disposed on the right rear portion J4 and the right front portion J2 of the second tray J6. Figure 6 and Figure 7 After the pallet is detected by the sensor, the following four detection results will be obtained: (1) The first pallet J5 is placed in the correct position: the third sensor A33 can sense and identify the bump (that is, the third sensor A33 has a sensing signal output to the electronic control device), and the first sensor A31 and the second sensor A32 cannot sense and identify the bump (that is, the first sensor A31 and the second sensor A32 have no sensing signal output to the electronic control device), see Figure 8 (2) The first tray J5 is placed in reverse: the first sensor A31 and the second sensor A32 can sense and identify the bump, but the third sensor A33 cannot sense and identify the bump. Fig. 9(3) The second tray J6 is placed in the correct position: the second sensor A32 and the third sensor A33 can sense and identify the bump, and the first sensor A31 cannot sense and identify the bump, see Fig.10 (4) The second tray J6 is placed in the reverse position: the first sensor A31 and the third sensor A33 can sense and identify the bump, and the second sensor A32 cannot sense and identify the bump, see Fig.11 shown.

[0052] In this embodiment, the above-mentioned pallet recognition logic is used to set the pallet. The pallet recognition method based on this embodiment is that the recognition module on the pallet will make some sensors sense, and each sensor will feed back the sensing signal to the electronic control device;

[0053] If the third sensor A33 can sense and identify the bump, and the first sensor A31 and the second sensor A32 cannot sense and identify the bump, the electronic control device determines that the empty pallet on the first inspection station is the first pallet J5 with the correct placement posture; the robot clamps the finished car crankshaft of the 2.0L engine onto the first pallet J5.

[0054] If the first sensor A31 and the second sensor A32 can sense and identify the bump, but the third sensor A33 cannot sense and identify the bump, the electronic control device determines that the empty pallet on the first inspection station is the first pallet J5 that is placed upside down; the electronic control device will send a warning signal to notify the operator to remove the pallet in time or put the pallet back in place.

[0055] If the second sensor A32 and the third sensor A33 can sense and identify the bump, but the first sensor A31 cannot sense and identify the bump, the electronic control device determines that the empty pallet on the first inspection station is the second pallet J6 with the correct placement posture; the robot clamps the crankshaft of the 2.5L engine onto the second pallet J6.

[0056] If the first sensor A31 and the third sensor A33 can sense and identify the bump, but the second sensor A32 cannot sense and identify the bump, the electronic control device determines that the empty tray on the first inspection station is the second tray J6 that is placed upside down. The electronic control device will send a warning signal to notify the operator to take away the tray in time or put the tray back in place.

[0057] In one embodiment, the first sensor A31, the second sensor A32, and the third sensor A33 are all opposite-beam photoelectric sensors, which include a transmitter and a receiver. The detection light emitted by the third sensor A33 is parallel to the extension direction of the guide roller A22. In order to make the detection result more accurate and prevent interference from other components, the detection lights emitted by the first sensor A31 and the second sensor A32 are cross-set, but the detection lights do not intersect. Through such a setting, the work of each group of sensors does not interfere with each other, and each sensor is set on the first roller conveyor mechanism through a sensor bracket, and the overall structure is relatively compact.

[0058] The feeding conveying device A is connected to the quality inspection table C through the side pulling conveying device B. Figure 1 As shown in the figure, the side-pull conveying device B includes a second frame B1, a second roller conveying mechanism B2 arranged on the second frame B1, a rib B3 arranged on the second roller conveying mechanism, a roller group B5 and a lifting mechanism (not visible in the figure) for controlling the lifting of the roller group, and the roller group B5 extends in the direction of the quality inspection table C. The lifting mechanism includes a connecting plate connecting all roller groups and a sixth cylinder arranged vertically, the sixth cylinder is fixedly arranged on the second frame B1, and the piston rod end of the sixth cylinder is connected to the connecting plate.

[0059] During operation, the second roller conveyor mechanism B2 receives the workpieces on the first roller conveyor mechanism A2 and conveys the pallet carrying the workpieces forward, the sidewall B3 blocks the pallet from continuing to be conveyed forward, and the lifting mechanism drives the roller group B5 to rise, so that the conveying plane of the roller group B5 is higher than the conveying plane of the second roller conveyor mechanism B2, so that the roller group B5 supports the pallet, and then the quality inspector manually pulls the pallet to the quality inspection table C. Since there is rolling friction between the bottom of the pallet and the roller group, the friction force is small, and the quality inspector can pull the pallet carrying the workpieces to the quality inspection table C with very little effort, which greatly reduces the labor intensity of the quality inspector.

[0060] In one embodiment, see Fig.12 , 13 As shown, the quality inspection table C includes a third frame C1, a transport panel C2 and a base plate C3 arranged on the third frame C1, and a first lifting mechanism C3 arranged on the base plate C3, the transport panel is located above the base plate, the first lifting mechanism C3 includes a mounting plate C31, a lifting arm C32 arranged on the mounting plate, and a first cylinder C33 for driving the mounting plate C31 to move vertically relative to the base plate C22, the lifting arm C32 is used to lift the workpiece placed on the transport panel C2, and the lifting arm C32 includes a support arm C4 fixedly arranged on the mounting plate and a positioning structure C5 arranged on the free end of the support arm.

[0061] The pallet is also provided with a handle J0. The quality inspector pulls the handle J0 on the pallet and slides from the side-pull conveyor device B to the quality inspection station C6 preset on the transport panel. Then the first cylinder C33 drives the mounting plate C31 and the lifting arm C32 to rise, firstly making the positioning structure C5 on the two lifting arms C32 respectively receive the front and rear shafts of the automobile crankshaft, and then the mounting plate C31 and the lifting arm C32 continue to rise, so that the automobile crankshaft is separated from the bearing of the pallet J. At this time, the automobile crankshaft is located directly above the pallet J. The quality inspector can flip the automobile crankshaft at any angle, so that the quality inspector can check all parts of the finished automobile crankshaft to determine whether there are quality defects; the finished automobile crankshaft without quality defects is considered as a qualified product. The first cylinder C33 drives the mounting plate C31 and the lifting arm C32 to descend and reset, so that the automobile crankshaft is placed on the pallet J again, and then the quality inspector pushes the pallet J and the automobile crankshaft together to the lifting conveyor device D. The finished automobile crankshaft with quality inspection defects is regarded as a defective product. The first cylinder C33 drives the mounting plate C31 and the lifting arm C32 to descend and reset, so that the automobile crankshaft is re-placed on the pallet J. Then the quality inspector slides the pallet J and the automobile crankshaft to the defective product placement rack. Compared with the existing quality inspection table, the quality inspection table provided by the present invention has a high degree of automation, and the quality inspection table is well connected with other conveying equipment. The quality inspector does not need to spend a lot of labor to carry out loading and unloading work, which greatly reduces the labor intensity of the quality inspector and improves the inspection efficiency.

[0062] Specifically, see Fig.12 and 13 As shown, the positioning structure C5 includes two positioning wheels C51 fixedly arranged on the side of the support arm C4, and a V-shaped receiving station C52 is formed between the two positioning wheels C51. During quality inspection, the end shaft of the automobile crankshaft will be stuck in the V-shaped receiving station C52, and the workpiece can be inspected for appearance quality in an all-round manner by rotating the automobile crankshaft, which is convenient for the smooth progress of quality inspection. Compared with the existing semi-wrapped positioning mechanism (i.e., a positioning block with a U-shaped slide groove, and the end shaft is stuck in the U-shaped slide groove), it has the following advantages: 1. The contact between the two positioning wheels C51 and the end shaft is line contact, and compared with the surface contact between the U-shaped slide groove and the end shaft, the contact area is smaller, and the quality inspector can rotate the automobile crankshaft with less force; 2. When the wheel surface of the positioning wheel C51 has a guiding function, if the workpiece is not facing the V-shaped receiving station, the wheel surface of the positioning wheel guides the end shaft of the automobile crankshaft to slide into the middle of the V-shaped receiving station, which greatly improves the adaptability of the positioning structure and the workpiece.

[0063] In order to make the quality inspection platform compatible with the detection of two types of automobile crankshafts, a position adjustment device C7 for driving the lifting arm to move laterally is provided on the mounting plate C31. In this embodiment, the position adjustment device C7 is only provided for the lifting arm for lifting the rear end shaft of the automobile crankshaft, while the lifting arm for lifting the front end shaft of the automobile crankshaft is fixedly provided on the mounting plate C31 and cannot move laterally relative to the mounting plate C31. Therefore, the distance between the two lifting arms C32 is adjusted according to the shaft length of the automobile crankshaft to be inspected, so as to ensure that the lifting arm C32 can lift the automobile crankshaft.

[0064] Specifically, see Fig.12 As shown, the position adjustment device C7 includes a guide rail C71, a slider C72, and a second cylinder C73. The guide rail C71 extends along the axial length of the workpiece. The bottom of the support arm C4 is slidably connected to the guide rail C71 through the slider C72. The second cylinder C73 is used to drive the support arm C4 and the slider C72 to move, so that the two lifting arms C32 are close to or away from each other. The electronic control device controls the output end of the second cylinder C73 to extend or reset according to the tray type recognition result of the loading and conveying device A.

[0065] In one embodiment, see Fig.12 As shown, the upper surface of the transport panel C2 is provided with a plurality of universal balls C21 and positioning balls C22. The plurality of positioning balls C22 surround a quality inspection station C6. The bottom surface of the pallet J is pressed against the universal balls C21, and the friction is small. The quality inspector can easily pull the pallet carrying the finished automobile crankshafts to the quality inspection station C6, and push the pallet flatly to the lifting and conveying device D or the defective product placement rack after the quality inspection is completed.

[0066] Preferably, see Fig.12 As shown, the mounting plate C31 is provided with an in-place sensor C8 for detecting whether the workpiece is turned into place after the quality inspection is completed. The in-place sensor C8 is preferably a proximity switch; the detection light emitted by the in-place sensor C8 is vertically upward. Since the inspection light cannot be directly observed, it is indicated by a dotted line; the detection light is used to sense the connecting shaft C9 on the crank. If the in-place sensor C8 can sense the connecting shaft C9, the workpiece is put in the right place after the quality inspection is completed; if the in-place sensor C8 cannot sense the connecting shaft C9, the workpiece is not put in the right place. Through this arrangement, it is ensured that the automobile crankshaft falls back to the accurate position of the pallet after the flipping inspection, so that the automobile crankshaft can be effectively positioned and supported by the pallet again. In order to adapt to the sensing of two types of automobile crankshafts, two in-place sensors C8 are correspondingly provided.

[0067] Preferably, the third rack C1 is provided with a lifting control button C01 and a lowering control button C02 that require both hands to control. The lifting control button C01 and the lowering control button C02 are both electrically connected to the control module on the quality inspection line. When the lifting action of the workpiece needs to be started, both hands need to be pressed at the same time to start the corresponding lifting control button C01 to avoid the operator's hand being pinched. Similarly, when the lowering action of the workpiece needs to be started, both hands need to be pressed at the same time to start the corresponding lowering control button C02.

[0068] In one embodiment, see Fig.14 As shown, the lifting and conveying device D includes a lifting frame D1, a base frame D2, a second lifting mechanism D3 arranged on the base frame D2, and a third roller conveying mechanism D4 arranged on the lifting frame D1, wherein the second lifting mechanism D3 is used to drive the lifting frame D1 to move vertically relative to the base frame D2; the third roller conveying mechanism D4 is provided with a lifting and thrusting mechanism D5, and the third roller conveying mechanism D4 is provided with a second sensing component D6 and a third sensing component D7, the second sensing component D6 is used to sense the setting position of the identification module on the pallet and feed back the sensing signal to the electric control device, and the third sensing component D7 is used to identify the type of the workpiece and feed back the sensing signal to the electric control device; the lifting and thrusting mechanism D5 is used to prevent the pallet from being conveyed forward. Here, the detection station on the third roller conveying mechanism D4 is set as the second detection station D8 (i.e., the position where the second sensing component D6 and the third sensing component D7 can normally detect the pallet and the workpiece).

[0069] In one embodiment, the second lifting mechanism D3 includes a fourth cylinder D31 vertically arranged upward, the cylinder body of the fourth cylinder is fixedly connected to the base frame D2, and the end of the piston rod of the fourth cylinder D31 is connected to the lifting frame D1 through a connecting plate D32.

[0070] When working, the second lifting mechanism D3 drives the lifting frame D1 and the third roller conveyor mechanism D4 to descend, so that the conveying plane of the third roller conveyor mechanism D4 is at the same height as the bearing surface of the quality inspection table C. The quality inspector pushes the pallet carrying qualified parts to the second inspection station D8 of the third roller conveyor mechanism D4 (i.e., the position where the second sensing component D6 and the third sensing component D7 can normally inspect the pallet and the workpiece). The recognition module will make some sensors of the second sensing component D6 generate sensing signals, while the other sensors cannot generate sensing signals. At this time, the electronic control device will obtain the sensing signals of the second sensing component D6, and the electronic control device will obtain the pallet recognition result after analysis. Similarly, the workpiece will make some sensors of the third sensing component D7 generate sensing signals, while the other sensors cannot generate sensing signals. At this time, the electronic control device will obtain the sensing signals of the third sensing component D7; the electronic control device will obtain the workpiece detection result after analysis, and the model of the workpiece can be known from the workpiece detection result. The control module continues to determine whether the pallet and the workpiece are correctly matched, and compares the pallet identification result with the workpiece detection result: (1) If the pallet is placed in the correct position and the type of the pallet and the workpiece are compatible, the pallet and the workpiece are considered to be correctly matched; (2) If the pallet is placed in the correct position, but the type of the pallet and the workpiece are not compatible, the pallet and the workpiece are considered to be incorrectly matched; (3) If the pallet is placed in the reverse position, regardless of whether the type of the pallet and the workpiece are compatible, the pallet and the workpiece are considered to be incorrectly matched. When the pallet and the workpiece are incorrectly matched, the quality inspector will pull the pallet carrying the qualified products back to the quality inspection table and put the pallet in the correct position according to the matching result or replace the pallet with the correct matching workpiece model. When the pallet and the workpiece are correctly matched, the second lifting mechanism D3 drives the lifting frame D1 and the third roller conveyor mechanism D4 to rise, so that the conveying plane of the third roller conveyor mechanism D4 is highly consistent with the conveying plane of the transfer upper roller conveyor mechanism of the first transfer conveying device E, and then the third roller conveyor mechanism D4 transports the pallet carrying qualified products to the first transfer conveying device E. Finally, the electronic control device will classify and cache according to the pallet recognition result or the workpiece recognition result.

[0071] After the unqualified workpieces are repaired, they will become qualified parts. These qualified parts will be placed on pallets, and then according to the above-mentioned workflow, the pallets carrying qualified parts will be transported to the lifting conveyor device D for identification and comparison. If the pallet and the workpiece are correctly paired, the electronic control device will control the lifting conveyor device D to transport the pallet carrying qualified products to the cache conveyor device F for classification and caching.

[0072] It can be seen that the lifting and conveying device D can identify the pallet and the workpiece through the second sensing component D6 and the third sensing component D7 respectively. On the one hand, it can intelligently determine whether the pallet and the workpiece match, and correct the matching error in time to avoid the occurrence of the workpiece and the vehicle type mismatching during loading. On the other hand, the pallet recognition result or the workpiece recognition result also provides a classification basis for the first transfer and conveying device E, and the degree of automation is high. In addition, the lifting and conveying device D is provided with a second lifting mechanism D3, so that the quality inspection table C and the transfer roller conveying mechanism of the first transfer and conveying device E are connected in height, and the flexibility is high.

[0073] In this embodiment, the above-mentioned pallet identification logic is used to set the pallet. The second sensing component D6 includes a fourth sensor D61, a fifth sensor D62, and a sixth sensor D63. The fourth sensor D61 is used to detect whether an identification module is provided on the right rear part J4 of the pallet. The fifth sensor D62 is used to detect whether an identification module is provided on the left rear part J3 of the pallet. The sixth sensor D63 is used to detect whether an identification module is provided on any part of the left front part J1 and the right front part J2 of the pallet. The fourth sensor D61, the fifth sensor D62, and the sixth sensor D63 are all through-beam photoelectric sensors, which include a transmitter and a receiver. The detection light emitted by the sixth sensor D63 is parallel to the extension direction of the guide roller. In order to make the detection result more accurate and prevent interference from other components, the detection lights emitted by the fourth sensor D61 and the fifth sensor D62 are cross-set, but the detection lights do not intersect.

[0074] Here, the sensing principles of the first sensing component A3 and the second sensing component D6 are the same, so after the pallet is sensed by the second sensing component D6, the following four detection results will be obtained: (1) The first pallet is placed in the correct position: the fourth sensor D61 and the fifth sensor D62 can sense and identify the bump, and the sixth sensor D63 cannot sense and identify the bump, see Fig.15 (2) The first tray J5 is placed in the reverse position: the sixth sensor D63 can sense and identify the bump, the fourth sensor D61 and the fifth sensor D62 cannot sense and identify the bump, see Fig.16 (3) The second tray is placed in the correct position: the fourth sensor and the sixth sensor D63 can sense and identify the bump, and the fifth sensor D62 cannot sense and identify the bump, see Fig.17 (4) The second tray is placed in reverse: the fifth sensor D62 and the sixth sensor D63 can sense and identify the bumps, but the fourth sensor cannot sense and identify the bumps, see Fig.18 shown.

[0075] Specifically, the third sensing component D7 includes a seventh sensor D71 and an eighth sensor D72. The first workpiece L1 is provided with a first distinguishing feature L3 that is different from the second workpiece L2, and the second workpiece L2 is provided with a second distinguishing feature L4 that is different from the first workpiece L1. In a specific implementation, the first workpiece L1 is a crankshaft of a 2.0L engine, and the second workpiece L2 is a crankshaft of a 2.5L engine. The first distinguishing feature L3 is that the two crankshafts are of different lengths, the crankshaft length of the 2.0L engine is shorter than the crankshaft length of the 2.5L engine, and the crankshafts of the two are arranged at different positions in the axial direction. The second distinguishing feature L4 is that the crankshaft of the 2.5L engine is provided with a toothed disc, while the crankshaft of the 2.0L engine is not provided with a toothed disc. The seventh sensor D71 is used to sense whether the workpiece has the first distinguishing feature L3; the eighth sensor 52 is used to sense whether the workpiece has the second distinguishing feature L4. It can be understood that if the workpiece is the crankshaft of a 2.0L engine, the seventh sensor D71 can sense the crank on the 2.0L engine crankshaft to generate a sensing signal, and the eighth sensor D72 cannot generate a sensing signal; if the workpiece is the crankshaft of a 2.5L engine, the eighth sensor D72 can sense the gear on the 2.5L engine crankshaft to generate a sensing signal, and the seventh sensor D71 cannot generate a sensing signal.

[0076] In one embodiment, the seventh sensor D71 and the eighth sensor D72 are both through-beam photoelectric sensors, which include a transmitter and a receiver. The detection light emitted by the seventh sensor is directed vertically downward. The transmitter of the seventh sensor D71 is mounted on the sensor bracket and located above the middle of the third roller conveyor mechanism. The receiver of the seventh sensor D71 is mounted on the lifting frame D1. The detection light emitted by the seventh sensor D71 does not interfere with the guide roller. The detection light emitted by the eighth sensor D72 is parallel to the extension direction of the guide roller.

[0077] An identification and comparison method based on a lifting and conveying device is as follows: a pallet is conveyed to a detection station, an identification module on the pallet causes some sensors in a second sensing component D6 to be sensed, and a workpiece on the pallet causes some sensors in a third sensing component D7 to be sensed, and each sensor feeds back a sensing signal to an electronic control device, which generates a pallet identification result and a workpiece identification result through analysis; the electronic control device compares the pallet identification result with the workpiece identification result.

[0078] If the pallet is the first pallet J5 with the correct placement in the pallet recognition result, and the workpiece is the first workpiece L1 in the workpiece recognition result, then the pallet and the workpiece are correctly paired;

[0079] If the pallet is the second pallet J6 with the correct placement in the pallet recognition result, and the workpiece is the second workpiece L2 in the workpiece recognition result, then the pallet and the workpiece are correctly paired;

[0080] If the pallet is the first pallet J5 with the correct placement in the pallet recognition result, and the workpiece is the second workpiece L2 in the workpiece recognition result, then the pairing of the pallet and the workpiece is incorrect;

[0081] If the pallet in the pallet recognition result is the second pallet J6 with the correct placement posture, and the workpiece in the workpiece recognition result is the first workpiece L1, then the pairing of the pallet and the workpiece is incorrect;

[0082] If the pallet is placed upside down in the pallet recognition result, the pallet and the workpiece are not matched correctly.

[0083] When the pallet and the workpiece are not matched correctly, the quality inspector will pull the pallet carrying qualified products back to the quality inspection table C, and put the pallet in the correct position or replace the pallet with the correct one according to the comparison result. When the pallet and the workpiece are matched correctly, the second lifting mechanism D3 drives the lifting frame D1 and the third roller conveyor mechanism D4 to rise, so that the conveying plane of the third roller conveyor mechanism D4 is highly consistent with the conveying plane of the upper layer of the first transfer and conveying device, and then the third roller conveyor mechanism D4 will convey the pallet carrying qualified products to the first transfer and conveying device E. Finally, the electronic control device will classify and cache according to the pallet recognition result or the workpiece recognition result.

[0084] In one embodiment, see Fig.19 As shown, the first transfer and conveying device E and the second transfer and conveying device G both include a base E1, a slide E2 slidably arranged on the top of the base, a transfer upper roller conveying mechanism E3 and a transfer lower roller conveying mechanism E4 arranged on the slide, and a slide driving mechanism E5; the transfer upper roller conveying mechanism E3 is located above the transfer lower roller conveying mechanism E4, the transfer upper roller conveying mechanism E3 of the first transfer and conveying device is provided with a second blocking mechanism E6 for blocking the pallet from being transported forward, and the transfer upper roller conveying mechanism E3 of the second transfer and conveying device G is provided with a third blocking mechanism G1 for blocking the pallet from being transported forward; the slide driving mechanism E5 is used to drive the slide E2 to move horizontally in a direction perpendicular to the workpiece transport direction. Similarly, the transfer lower roller conveying mechanism E4 of the first transfer and conveying device E is provided with a tenth blocking mechanism for blocking the pallet from being transported forward, and the transfer lower roller conveying mechanism E4 of the second transfer and conveying device G is provided with an eleventh blocking mechanism for blocking the pallet from being transported forward.

[0085] Here, the upper transfer roller conveyor mechanism E3 is used to convey pallets carrying qualified parts, and the lower transfer roller conveyor mechanism E4 is used to convey empty pallets. Through such an arrangement, the upper transfer roller conveyor mechanism E3 and the lower transfer roller conveyor mechanism E4 have dual-line conveying capabilities, namely, workpiece conveying function and empty pallet return function, which saves space and improves transportation efficiency; on the other hand, according to production needs, the slide E2 can be driven to move through the slide drive mechanism E5, so that the workpiece on the roller is transferred to the input end or output end of the corresponding cache conveyor device F, so as to meet the single or mixed model quality inspection requirements of the quality inspection line.

[0086] When working, the electric control device obtains the pallet model recognition result through the analysis of the lifting conveyor device D, and then the qualified products are transported to the transfer roller conveyor mechanism E3 of the first transfer conveyor device E. The second blocking mechanism E6 on the transfer roller conveyor mechanism E3 blocks the pallet carrying the qualified products from continuing to be transported forward, and then the control system controls the slide drive mechanism E5 to move the slide E2 to the corresponding cache roller conveyor mechanism E3 of the cache conveyor device F. The second blocking mechanism E6 releases the blocking to allow the pallet carrying the qualified products to be transported to the cache conveyor device F for caching; when a transport trolley arrives at the output end of the unloading conveyor device H to take away the qualified products of the required model When the qualified products are being transported to the loading and unloading roller conveyor mechanism E3 of the second loading and unloading conveyor mechanism G, the electronic control device controls the slide driving mechanism E5 on the second loading and unloading conveyor device G to move the slide E2 to the input end of the unloading roller conveyor mechanism of the unloading conveyor device H, and the third blocking mechanism G1 releases the blocking to allow the pallet carrying the qualified products to be transported to the unloading conveyor device H.

[0087] In one embodiment, see Figure 20-22As shown, each of the cache conveying devices F includes a fourth frame F1, a cache upper roller conveying mechanism F2 arranged on the fourth frame F1, and a cache lower roller conveying mechanism F3. The cache upper roller conveying mechanism F2 is located above the cache lower roller conveying mechanism F3. The cache upper roller conveying mechanism F2 is provided with a plurality of upper cache stations F4 and a plurality of first detectors F5 corresponding to detecting whether there are workpieces in each upper cache station F4. The cache lower roller conveying mechanism F3 is provided with a plurality of lower cache stations F6 and a plurality of second detectors F7 corresponding to detecting whether there are workpieces in each lower cache station F6. The upper cache station closest to the output end of the cache upper roller conveying mechanism is the first cache station F8. The front and rear sides of the first cache station F8 are respectively provided with a fourth blocking mechanism F9 and a fifth blocking mechanism F10. The fourth blocking mechanism F9 is used to block the pallet on the first cache station F8 from being conveyed forward, and the fifth blocking mechanism F10 is used to block the pallet on the upper cache station located at the rear side of the first cache station F8 from being conveyed forward. Similarly, the lower cache station closest to the output end of the cache lower roller conveyor mechanism is the second cache station. The second cache station is respectively provided with an eighth blocking mechanism and a ninth blocking mechanism on the front and rear sides. The eighth blocking mechanism is used to block the empty pallet on the second cache station from being conveyed forward, and the ninth blocking mechanism is used to block the empty pallet on the lower cache station located on the rear side of the second cache station from being conveyed forward.

[0088] In this embodiment, the quality inspection conveying device provided by the present invention is designed to realize quality inspection of two types of automobile crankshafts, so two buffer conveying devices F are arranged in parallel, and each buffer conveying device F is corresponding to caching a model of workpieces, and qualified products are transported to the corresponding buffer conveying device F through the first transfer conveying device E to realize classified caching. When a transporting cart requests to transport qualified products, the fourth blocking mechanism F9 releases the blockage, and the fifth blocking mechanism F10 remains blocked; the pallet carrying qualified products continues to be transported forward, so that the qualified products on the first buffer station F8 are transported to the second transfer conveying mechanism G, and then the fourth blocking mechanism F9 resumes the blockage, the fifth blocking mechanism F10 releases the blockage, and the workpieces on the upper buffer station F8 move forward. Each first detector F5 corresponds to an upper buffer station F8, and the first detector F5 can detect the number of qualified products in all upper buffer stations F8 in real time, so that the electronic control device plans the plan and efficiency of qualified product transportation.

[0089] In one embodiment, see Fig.23As shown, the unloading conveying device H comprises a fifth frame H1, an unloading roller conveying mechanism H2 and a pallet return roller conveying mechanism H3 arranged on the fifth frame H1; the unloading roller conveying mechanism H2 is located above the pallet return roller conveying mechanism H3, and a sixth blocking mechanism H4 for blocking the pallet from being transported forward is arranged at the output end of the unloading roller conveying mechanism H2. The unloading conveying device is provided with a third detector H5 for detecting whether the workpiece is in place.

[0090] The sixth blocking mechanism H4 on the unloading roller conveyor mechanism H2 blocks the pallet carrying qualified products from continuing to be conveyed forward, and the third detector H5 feeds back the detection information to the electronic control device; when a transport cart transports the qualified products, the sixth blocking mechanism H4 releases the blocking, and the transport cart transports the pallet and the crankshaft to the loading area.

[0091] In one embodiment, the pallet return roller conveyor mechanism is provided with a fourth sensing component and a seventh blocking mechanism (not visible in the figure); the fourth sensing component is used to sense the setting position of the identification module on the empty pallet and feed back the sensing signal to the electric control device; the seventh blocking mechanism is used to block the pallet from being conveyed forward. The fourth sensing component can identify the model and placement posture of the empty pallet, so that the empty pallet can be conveyed to the corresponding buffer conveyor device through the second transfer conveyor device according to the type of the empty pallet. Since the inspection principle of the fourth sensing component is the same as that of the first sensing component, the inspection principle of the fourth sensing component will not be repeated here.

[0092] When working, the sixth blocking mechanism H4 blocks the pallet carrying qualified products from continuing to be transported forward. When a transport trolley transports the qualified products, the sixth blocking mechanism H4 releases the blocking, and the transport trolley transports the pallet and the crankshaft to the loading place. After the loading is completed, the empty pallet will be sent back to the pallet return roller conveyor mechanism by the transport trolley. The seventh blocking mechanism blocks the empty pallet from continuing to be transported forward and waits for further classification and processing. It can be seen that the unloading conveying device has a dual-line conveying capacity (two independent workpiece conveying capacities), a compact structure, and saves space.

[0093] After loading is completed, an empty pallet is generated, and the transport trolley transports the empty pallet back to the pallet return roller conveyor mechanism H3 of the unloading conveying device H. The pallet return roller conveyor mechanism H3 identifies the model of the empty pallet, so that the electronic control device knows the model of the empty pallet. The empty pallet is transported to the transfer lower roller conveyor mechanism E4 of the second transfer conveying device G. The eleventh blocking mechanism of the transfer lower roller conveyor mechanism E4 blocks the empty pallet from continuing to be transported forward, and then the electronic control device controls the slide drive mechanism E5 to move the slide E2 to the corresponding cache lower roller conveyor mechanism of the cache conveying device F. The eleventh blocking mechanism releases the blockage to allow the empty pallet to be transported to the cache conveying device F for caching. The electric control device selects an empty pallet of a suitable model to load the loading conveyor device A according to the current production demand. The electric control device controls the carriage driving mechanism E5 on the first transfer conveyor device E to move the carriage E2 to the output end of the corresponding cache lower roller conveyor mechanism F6 of the cache lower roller conveyor mechanism F6. The tenth blocking mechanism on the cache lower roller conveyor mechanism F6 blocks the empty pallet from continuing to be transported forward. Then the electric control device controls the carriage driving mechanism E5 to move the carriage E2 to the input end of the loading conveyor device A. The tenth blocking mechanism releases the blocking to transport the empty pallet to the loading conveyor device A. The handling robot clamps the automobile crankshaft of the corresponding model of the pallet onto the empty pallet. It can be seen that the quality inspection conveyor device for automobile crankshafts provided by the present invention has both the workpiece conveying function and the empty pallet return function. It is cleverly designed, saves space, and improves handling efficiency.

[0094] In this embodiment, please refer to Fig.21 The first blocking mechanism A4, the second blocking mechanism E6, the third blocking mechanism G1, the fourth blocking mechanism F9, the fifth blocking mechanism F10, the sixth blocking mechanism H4, the seventh blocking mechanism, the eighth blocking mechanism, the ninth blocking mechanism, the tenth blocking mechanism, and the eleventh blocking mechanism all include a first support plate F91, a driving cylinder F92 vertically arranged on the first support plate F91, and a baffle F93 arranged at the end of the piston rod of the driving cylinder F92. When blocking, the driving cylinder F92 drives the baffle F93 to extend upward and higher than the bearing surface of the roller conveyor mechanism, thereby blocking the pallet from being transported forward; when unblocking, the driving cylinder F92 drives the baffle F93 to reset, and the pallet continues to be transported forward.

[0095] Preferably, two guide rods F94 are provided on the bottom surface of the baffle F93, and a sliding sleeve F95 corresponding to the position of the guide rod is fixedly provided on the first support plate F91, and the two guide rods F94 are respectively slidably inserted in the sliding sleeve F95. Through the guiding effect of the sliding sleeve F95 and the guide rod F94, the correct movement direction of the baffle F93 can be ensured, and the piston rod of the driving cylinder F92 can be prevented from being subjected to shear force, thereby preventing the piston rod from being deformed due to the shear force.

[0096] In this embodiment, please refer to Figure 3The loading conveying device A, the side thrust device B, the first transfer conveying device E, the second transfer conveying device G, the buffer conveying device F, and the unloading conveying device H are all provided with a thrust mechanism P, and the thrust mechanism P includes a second support plate (not visible in the figure) and a plurality of thrust stops P1. The thrust stops P1 include a support P11 on the second support plate, a thrust block P12 rotatably arranged on the support P11, a limiting groove P13 is provided on the support, and the thrust block P12 is arranged in the limiting groove P13 through a pin shaft P14. A torsion spring P15 is provided on the pin shaft P14, and the torsion spring P15 is used to pull the thrust block P12 so that the thrust block P12 is pressed against the support P11.

[0097] When the pallet is conveyed forward, pallet J overcomes the elastic force of the torsion spring and pushes the thrust block P12 to swing, so that the bottom surface of pallet J presses the thrust block P12, and the pallet J is smoothly conveyed forward. After pallet J passes through the thrust mechanism P, the elastic force applied by the torsion spring P15 to the thrust block P12 pulls the thrust block, so that the thrust block P12 is pressed against the limit groove P13. At this time, the thrust block P12 is in a vertical state. Even if pallet J pushes the thrust block P12 backward, the thrust block P12 will be restricted from rotating by the support P11, thereby preventing the pallet from continuing to move backward, ensuring that the pallet can only move in one direction.

[0098] Similarly, the lifting thrust mechanism D5 includes a third support plate arranged on the lifting frame D1, a fifth cylinder arranged vertically upward on the third support plate, a connecting block arranged at the end of the piston rod of the fifth cylinder, and thrusters P respectively arranged at both ends of the connecting block.

[0099] In this embodiment, please refer to Figure 4 The first roller conveyor mechanism A2, the second roller conveyor mechanism B2, the third roller conveyor mechanism D4, the upper roller conveyor mechanism E3, the lower roller conveyor mechanism E4, the upper buffer roller conveyor mechanism F2, the lower buffer roller conveyor mechanism F3, the unloading roller conveyor mechanism H2, and the pallet return roller conveyor mechanism H3 are all roller conveyor mechanisms, and the roller conveyor mechanism includes two mounting seats A21, a plurality of guide rollers A22 arranged between the two mounting seats, a driving motor A23, and a transmission mechanism, and the driving motor drives these guide rollers to rotate synchronously through the transmission mechanism.

[0100] In one embodiment, the transmission mechanism includes a torque limiter A24 arranged on the output end of the driving motor A23, a friction sprocket A25 is arranged on the torque limiter, and a driving sprocket A26 and a driven sprocket A27 are arranged at the end of each guide roller, the friction sprocket is connected to the driving sprocket on one of the guide rollers through a first chain A28 (only part of the chain is shown in the figure), and the driven sprockets on these guide rollers are connected through a second chain A29. The torque limiter A24 includes a coupling body, an active friction plate, a passive friction plate, a disc spring, and a locking end cover arranged on the coupling body, the friction sprocket is arranged between the active friction plate and the passive friction plate, and the disc spring is used to press the passive friction plate so that the friction sprocket rotates under the friction provided by the active friction plate and the passive friction plate. The compression amount of the disc spring can be adjusted through the locking end cover, thereby playing a role in adjusting the preset value of the torque of the torque limiter. During manual operation, the operator's hands are in danger of being caught in the gap between the guide rollers. Since the output end of the drive motor is connected to the friction sprocket through a torque limiter, when the external force received by the guide roller exceeds 75N, the transmission torque of the friction sprocket and the torque limiter will increase instantly and exceed the preset sliding torque value of the torque limiter, causing slippage between the friction sprocket and the torque limiter, so that the guide roller stops moving immediately, thereby achieving the purpose of safety protection for manual operation.

[0101] Preferably, a guide bar A61 is provided on the inner side of the two mounting seats A21, and the guide bar A61 is fixedly connected to the mounting seat A21 through a guide adjustment plate A62. The pallet moves between the two guide bars, and the guide bar A61 guides the pallet to maintain a straight moving track to prevent the pallet from running off and affecting the placement accuracy of the automobile crankshaft. In addition, the distance between the two guide bars A61 can be adjusted by the position of the guide adjustment plate A62 to better improve the motion guidance accuracy of the pallet.

[0102] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. A quality inspection and conveying device for automobile crankshafts, characterized in that: It includes a loading conveyor, a side-pull conveyor, a quality inspection table, a lifting conveyor, a first transfer conveyor, a buffer conveyor, a second transfer conveyor, a unloading conveyor and an electric control device; the loading conveyor is used to identify the model and placement posture of the pallet and convey the pallet carrying the workpiece forward; the side-pull conveyor is used to guide the pallet to be pulled sideways to the quality inspection table; the quality inspection table is used to perform qualified inspection on the workpiece; the lifting conveyor is used to pair and identify qualified products and pallets, and convey the pallet carrying qualified products to the first transfer conveyor; there are more than two buffer conveyors, which are arranged in parallel, and each of the buffer conveyors can cache multiple qualified products; The first transfer conveyor device is used to transport pallets carrying qualified products to corresponding buffer conveyor devices for classified caching; the second transfer conveyor device is used to transport pallets carrying qualified products in the buffer conveyor device to the unloading conveyor device; the unloading conveyor device is used to transport pallets carrying qualified products to the transport trolley; the loading conveyor device, the side-pull conveyor device, the quality inspection table, the lifting conveyor device, the first transfer conveyor device, the buffer conveyor device, the second transfer conveyor device, and the unloading conveyor device are all electrically connected to the electronic control device, and their operation is controlled by the electronic control device; the loading conveyor device includes a first frame, a first roller conveyor mechanism arranged on the first frame, and a first induction component arranged on the first roller conveyor mechanism and a first blocking mechanism; each pallet is provided with an identification module arranged at a predetermined position, the first sensing component is used to sense the setting position of the identification module on the pallet, and feed back the sensing signal to the electronic control device; the first blocking mechanism is used to block the pallet from being transported forward; the quality inspection table includes a third frame, a transport panel and a bottom plate arranged on the third frame, and a first lifting mechanism arranged on the bottom plate, the transport panel is located above the bottom plate, the first lifting mechanism includes a mounting plate, a lifting arm arranged on the mounting plate, and a first cylinder for driving the mounting plate to move vertically relative to the bottom plate, the lifting arm is used to lift the workpiece placed on the transport panel, the lifting arm includes a support arm fixedly arranged on the mounting plate and a support arm free The positioning structure on the end, the positioning structure includes two positioning wheels fixedly arranged on the side of the support arm, and a V-shaped receiving station is formed between the two positioning wheels; the lifting and conveying device includes a lifting frame, a base frame, a second lifting mechanism arranged on the base frame, and a third roller conveying mechanism arranged on the lifting frame, the second lifting mechanism is used to drive the lifting frame to move vertically relative to the base frame; the third roller conveying mechanism is provided with a lifting and thrust mechanism, the third roller conveying mechanism is provided with a second sensing component and a third sensing component, the second sensing component is used to sense the setting position of the identification module on the pallet and feed back the sensing signal to the electronic control device; the third sensing component is used to identify the type of the workpiece; the lifting and thrust mechanism is used to prevent the pallet from being conveyed forward.

2. The quality inspection and conveying device for automobile crankshafts according to claim 1 is characterized in that: The side-pull conveying device includes a second frame, a second roller conveying mechanism arranged on the second frame, a rib arranged on the second roller conveying mechanism, a roller group and a lifting mechanism for driving the roller group to rise and fall, and the roller group extends toward the direction of the quality inspection platform.

3. The quality inspection and conveying device for automobile crankshafts according to claim 1 is characterized in that: A position adjustment device for driving the lifting arm to move laterally is provided on the mounting plate, and the position adjustment device includes a guide rail, a slider, and a second cylinder; the guide rail extends along the axial length direction of the workpiece, and the bottom of the support arm is slidably connected to the guide rail through the slider, and the second cylinder is used to drive the support arm and the slider to move.

4. The quality inspection and conveying device for automobile crankshafts according to claim 1, characterized in that: The first transfer and conveying device and the second transfer and conveying device both include a base, a slide slidably arranged on the top of the base, an upper transfer roller conveying mechanism and a lower transfer roller conveying mechanism arranged on the slide, and a slide driving mechanism; the upper transfer roller conveying mechanism is located above the lower transfer roller conveying mechanism, the upper transfer roller conveying mechanism of the first transfer and conveying device is provided with a second blocking mechanism for blocking the pallet from being conveyed forward, and the upper transfer roller conveying mechanism of the second transfer and conveying device is provided with a third blocking mechanism for blocking the pallet from being conveyed forward; the slide driving mechanism is used to drive the slide to move horizontally in a direction perpendicular to the workpiece transportation direction.

5. The quality inspection and conveying device for automobile crankshafts according to claim 1, characterized in that: Each of the cache conveying devices includes a fourth frame, a cache upper roller conveying mechanism arranged on the fourth frame, and a cache lower roller conveying mechanism. The cache upper roller conveying mechanism is located above the cache lower roller conveying mechanism. A plurality of upper cache stations are arranged on the cache upper roller conveying mechanism. The cache station closest to the output end of the cache upper roller conveying mechanism is the first cache station. A fourth blocking mechanism and a fifth blocking mechanism are respectively arranged on the front and rear sides of the first cache station. The fourth blocking mechanism is used to block the pallet on the first cache station from being conveyed forward, and the fifth blocking mechanism is used to block the pallet on the cache station located on the rear side of the first cache station from being conveyed forward.

6. The quality inspection and conveying device for automobile crankshafts according to claim 1, characterized in that: The unloading conveying device includes a fifth frame, an unloading roller conveying mechanism and a pallet return roller conveying mechanism arranged on the fifth frame; the unloading roller conveying mechanism is located above the pallet return roller conveying mechanism, and a sixth blocking mechanism for blocking the forward conveyance of the pallet is arranged on the output end of the unloading roller conveying mechanism.

7. The quality inspection and conveying device for automobile crankshafts according to claim 6, characterized in that: The pallet return roller conveyor mechanism is provided with a fourth sensing component and a seventh blocking mechanism; the fourth sensing component is used to sense the setting position of the identification module on the empty pallet and feed back the sensing signal to the electronic control device; the seventh blocking mechanism is used to block the empty pallet from being conveyed forward.

Images